Another update. This is definitely looking better.

I personally think the design is to plain and blocky. I think adding some white to the black to define features, such as his eyes and folds in his cloak would make it stand out a lot more. Take these for example.




Ok, here’s another update. I’m hesitant to keep adding more details as they may be lost in translation.

The overall silhouette shape isn’t very interesting. It’ll be far more interesting if you actually depicted the whole figure–Batman walking alone in the night by himself, and have his cape being blown to the side by the wind, and the force of the wind is what dissolves part of the cape into the flying bats.
Hi, I’ll disagree with both Lunatique and rownd. I think that what you have at the moment is going in the right direction and you don’t need a full scale figure, especially for a tattoo. I do agree however with above suggestions that the presentation looks very rectangular as whole and maybe some dynamism could be introduced by shaping the entire piece more into a curved line/wave/sinusoid. Then again, considering this is a tattoo, I would suggest to think about the design in the following order - 1) Where does it go and how will it fit? 2) Representation of theme aka full figure Batman or body art as fashion choice?
Below is a version the way Lunatique described. I think it’s decent, but not as interesting (of course that could just be my illustration).
Darkonerster, the tattoo will likely go on either my shoulder or calf. It’s definitely not a fashion thing, at least not in the sense of showing off to others. I’ve been wanting to come up with a tattoo idea for a while simply because I’ve grown to like the art form, and since I’ve been a fan of batman for a long time, I figured that would be a good choice (another choice was Giger’s Li II, but that’s incredibly detailed, and thus costly, and I’m not sure my wife and daughter would be so keen about the look of it :p)
I think the wave idea is cool - I already was headed in that direction with the latest version (before this one), so I could try pushing it more.

Consult with a tattoo artist THROUGHOUT the design.
As interesting as some of the stuff is, I can tell you for a given that as is, even if you’re lucky skin-wise and put yourself in the hands of an extremely well seasoned artist, it will bleed off all the white insets in just a few years, about at the same time when the bats closer to the cape will be smudged out to non-descript shapes.
That’s unless you plan on having it across your whole back, in which case separation should hold to that size 
It helps if you have other, older tattoos too to know what level of dispersion and blur your skin will induce.
That graphic-y style is also not how you normally evaluate a tattoo.
Unless you plan on having the window/framing inked as a white out (which is next to impossible to have paper white, let alone backlit monitor white), you might be in for a surprise.
Put the line work that will be stenciled out down first and flip frequently. Most importantly, get a consultation with a tattoo artist on the design process or buy a couple books (if you haven’t yet).
Sorry, this might or might not be the feedback you were after, but one of the number one mistakes I see artists doing when they design their own is thinking that rendering and framing a tattoo works the same way as graphic design or normal illustration. The rules are very different when your media is ink under skin.
Thanks, I will definitely consult with the artist - I don’t plan on just giving him the image and saying “here, do this”. And yes, I was concerned about the details as well, which is why I was trying to avoid putting too much in. I also never planned on having the white areas inked - just the black areas. Finally, these designs are more starting points than final designs - I figure the artist will take liberties and do what s/he feels will work/look best.
Anyway, after looking at the latest two designs, I decided I like the top of the one with the full body but with the legs removed as in the rest of the designs. So I combined them together to make a this new version, which I think is the best so far:

It does feel stronger than the previous two pieces.
If I may: the same concept, but with the classic “hunching over gargoyle” pose, and a more 3/4 view like the first image in Ishimarushou’s post might be stronger still, and would allow for more diagonal lines and a wider spacing of elements (likely to result in less dispersion).
Flat views get boring quickly enough, and the last thing you want with ink is something that’s likely to get boring quick.
Ok, I spoke to some tattoo artists, and they all had the same recommendations - enlarge the white spaces and make it more vertical to fit my arm/leg.
So I’ve redesigned it (with your hunched over idea, Jaco). This is still a bit rough, but it’s the basic idea. I still like the motion of the last design, but I’m not sure how to convey that in a vertical layout.

Your new concept is not as powerful as your first one. The cape turning into bats was a good idea. You kind of lost that.
I would say be carefull of having a big black surface, depending on where on your body it can read badly.
you can have gradiations between the black and white to detail or soften it.
Any ideas on how to fix that? The problem is that as a tattoo, it can’t have such small white spaces, and without those, it’s difficult to make it look like the cape is turning into bats. Instead it just looks like they’re flying from behind the cape.
I’ve seen some detailed tats and looks they keep everything clear. Make the cape to bat area bigger and less bats?
I’m a tattoo artist and illustrator. I would recommend a vertical explosion with the design. Here is my idea I sketched in under 5 minutes.

Layout wise, for a limb, I think it’s a good idea.
I don’t find it, pose wise, to be a batman thing though. Batman is iconic when hunched down and looking at things from above, it’s a big point of the graphic connection to the spirit of the character.
A curvy, up-facing piece ala ascension probably doesn’t quite work as well for the character.
@Artfoundry: What I meant is keep it a sideview, hunch him over, and and have cape/bats spiralling down below instead of sideways.
It will retain the batman feeling and you can, to some degree, incorporate the cape to bats design, and should work to a better layout.
If it’s a calf piece make sure it balloons in themiddle, tapers down the length downwards, and stops abruptly enough at the top. Calf pieces IMO roll like crap, so keeping it mostly contained width wise will be important. If it’s an arm piece then I reckon it’ll be a fair bit harder, but that’s because I’m not a fan of that kind of design on arms. If it was me in that case I’d turn it into a half sleeve or even a 7/10ths 
I agree with JacO. While the layout is cool and good for a vertical tattoo, it doesn’t really convey the feel and mythos of Batman.
I added more bats to the last idea to make it look more like the cape was turning into bats. However, I realized that part of the problem is that the cape is lying static in this one - there’s no motion to it, which is why the it turning into bats is not as dramatic looking.

JacO, I understand what you’re saying about having him look sideways, but after making him face forward, I really like that more - I think it adds more to the tension. Also, I think having the bats go down will look odd since bats would normally be flying above him (or at least at his height). I actually did try something similar to what you’re talking about though - making his cape flow down and then curve back up, with the bats flying out of the part that curved back up. I was trying to design it a bit in the shape of a treble clef (music is another of my passions), but it just ended up looking weird - too many changes in direction/flow.
Here’s another idea - this is more symbolic than realistic. I think it’s cool that it has the bat logo incorporated into it, but it doesn’t really have the sense of drama/action/tension the others have.

Ok, another new idea - not very original, but it has the vertical design going for it, and I like the way the bats are done better in this than the last one. Has the same layout as Architectus’ idea, but it’s more batman like.
