Thanks for the comments
pixelblink: Thanks, it didn't turn out exactly the way I wanted it, but I did learn a thing or two. I don't remember where I read that, but if you're trying new stuff, don't be too set on the final result, that just blocks you, but work step by step. Even if that means that you'll stray from your first mental image, it's a much more valuable learning experience, and you're more likely to come across new methods to achieve certain effects that you didn't initially think of. With time it'll become easier to nail your ideas better at the first tries.
Sohashu: Who knows, maybe I'll continue with this when I have more time again in summer. Right now my schedule is pretty full until the end of June.
Zee: Thanks.
Rydin: Thank you for the critique. About the first one, well, heh, it simply is unfinished. I faintly remember finishing up the left half before even touching the other, and then I just cleaned up the right half so it didn't clash as much if I wanted to show it to somebody. I might go over it again.
On the centaur, I think the highlights are fine, though I'm not too fond of the axe in general.
Agreed on the two yellows being rather close.
As for the zombie boxer, that basically how I wanted it to look really, trying a more flat coloring style.