Here's my critique: Her body looks very stiff. The lack of curved lines make her arms look rigid and straight, when arms have lines curving in and out to indicate the beginning of the forearm. Her shirt also looks flat. I know she's tugging on her shirt from the bottom but there should be some lines or shading to indicate that the shirt is being stretched downward. And there's the wings. Aside from the shape, they don't look to be wings at all because they don't look to be made of feathers, more like straw or hair. There are some tutorials here on DA on how to make feathers, so I suggest you browse for "feather tutorials" or "wing tutorials".
Now onto the good stuff. The coloring and shading is nice, and I like the use of yellows and purples. Though when it comes to shading, try not to use darker shades of the original color as that gives the pic a dull shading. For skin, use browns and reds to give it a more lively texture, and using complimentary colors to shade also helps with creating a stark contrast.
I hope this all helps.