Hi Harry,
First off I think your reel has promise.
I like the Ferrari… the modeling was tight. The interior looked good, but for that particular car the interior is kind of uninspiring… but I agree with lehmi, the lighting extures could be better so that’s detracting from it a bit.
I really liked the space plane. Textures, modeling… looked good. The character… well. I’m not a character modeler, but I know some and really what you should decide is if you want to be a character modeler, a hard-surface modeler, or both.
If both you’ll need to improve your character skills. You’ll be competing with guys that make all sorts of characters… men, women, monsters etc. And again the texturing needs to be shown and it needs to be stellar.
As for the rest, the printer was ok, but again are you showing your animation skills or modeling skills?
If you’re only interested in modeling then you should stick to showing that. The textures and lighting and colors weren’t so hot, so if you’re going to show a printer as an example of your modeling (and not animation / compositing) then show that… turning… with good textures and good lighting.
The end sea thing… was ok, but again maybe a little out of place.
So to sum up I would advise to really decide on what you want to do / show. Not that you can’t do everything… if that’s what you want… but you indicated you wanted to be a modeler… so if that’s the case, stick to that. And know that if you want to be a hard-surface AND character modeler at a studio you have to be VERY good at both.
I don’t know what 3d package you are using, but that may also have an effect on where you get a job.
And brush up on your lighting / texturing as well. I think modeling-wise on a hard surface you could probably land a job if you improve your texturing and lighting a bit. But I think you’ll probably need more examples if that’s the direction you head since you only have three models.
Although really the two that are impressive are the Ferrari and space plane… I’d axe the printer unless you have some crazy detail in the circuit board or something like that.
Again I think your reel has promise… just needs some polishing and you’ll be there man 
Good luck!