I am horrible at righting critiques, but I'll give it a shot!
I really like the look on Rainbow's face. The shading on the clouds is really awesome! I also like how you made her tail merge into being the rainbow. Her wings are good but probably could look a little more like the real thing... Overall though, I really like this picture! I mean, it's way better than I could do, so who am i to judge?
Well, there you go! I did my critique as fair as as i can and i also rated it like that too! I am just trying to give an honest opinion! I really like this picture! your good with pencils!!!