For me, yes, it’s worth adding them.
If you take a walk through the woods one late night, there will be a lot going on around you that you might not immediately notice, but you’ll still be aware of them. There might be moths fluttering by that you, engaged in watching the moon, don’t take much notice of… but they’re still there, and I have no doubt that subconsciously, they’re affecting your mood.
Likewise, a little frog on a rock in a painting where the frog isn’t really interacting with any of the characters might never be noticed, but it’s there, and it gives life to the image.
Furthermore, when you paint, if you paint the level of detailing to look good at any particular format – and you’re aiming for, say, web-format – it just won’t look as good as if you paint it in a more complicated manner and then shrink it down.
Having been at this for a while, I’ve noticed that the paintings I create that have the biggest impact, that people remember and write letters to me about even years later, are also the ones where the devil got hold of me and I worked like a crazy person on every little detail down to a tiny bird hidden in the foliage or the shape of a toe that’s hardly visible in the format they’re viewed it in.
In addition, I love the thought that to fully appreciate all the details, you have to view this image in a huge, huge format – it still works when you’ve shrunk it down (why I said you always have to make sure it looks good before detailing) – but if you ever get to see a glimpse of the full resolution size, you’ll know that there’s a world of things going on there that most will never see.
At the end of the day, maybe it just makes a difference to me. I’m a perfectionist, no way I’m letting go of something before I’m fully happy with it. I can work on a dress pattern or the shape of eyelashes for a week until I’m satisfied. The end result always seems to be better when I don’t let go until I’m happy. We all work in different ways… just saying that one should keep it simple because that’s how it’s supposed to be is, I think, simplifying things a little too much.
I’d say heaven is in the details. Few are the simple, clean pictures that hold my attention more than three minutes. The ones where I can look around for interesting things for half an hour or more, those are the ones I’ll remember.
(As far as movies and sets go - I think the LOTR movies are a nice example of how much detailing can help the mood of something. It’s INSANE to see the work that has gone into the sets that they use. The tiny touches to the face of statues, the insane level of details in the fabrics of the clothes, the patterns in the armour - these things, you might never pause your dvd and stare at and notice the perfection of it, but hell, I bet they’re making a huge difference anyway.)

, Mercedes Benz, Nikon, Victoria Secret laces…these are incredibly complex operating devices yet have incredibly intuitive interfaces. That does not make them “simple” at all. They are easier to operate yes, but that’s because the designer has put an extraordinary effort to extrapolate the complexities, and produce a pattern withwhich it can be synchronized with human intuition.
Bring it on…