>>170016looks to me like you're trying to be too precise. Although percision can be a good thing, if you try too hard, it looks odd. try to make things a bit more natural (kinda' hard for a fairy, though, considering they're a glowyball with wings...) maybe made the inside of the wings blend and fade to the lighter color other than bold wing color with no inner color...
Sadly, it also helps if you can draw on paper. You said you couldn't, and I'm not tryin' to be mean, so yeah... but it usually helps...
also, last thing. I think by your posts that you're using a mouse. pentabs are much better for drawings done on computers, at least in my opinion.
Ultimately, the only way to get better at something is to keep practicing. It might be slow, or take a lot of time, but keep at it, and eventually you'll be fine.
Good luck, and happy arting.