Well, first thing I'm noticing is that the wings look way too segmented.
Here, a guide on how wings are structured:
You could fix what you have now somewhat though by simply making the top edge more solid to give it a more structured look.
On non-wing related stuff, her hair kinda billows out too much and gives her head an inflated appearance, i'm not sure if that's what you were going for but notable nonetheless.
The hands are also too small, and contrast pretty hard with the otherwise-realistic proportions. Don't cut things off at the wrist, and try to add those fingers and thumbs.
Finally, the feet need a lot of work. If you need a good guide, try to think of them primarily as basic shapes to simplify the process of drawing them.
Like so, this is a bit of a rough example but the method I use is I start with a ball then add two triangles and a square for the toes. The back triangle I then round out a bit, and I have a side foot.
The front is mostly the same too, I just add more squares and eliminate that second triangle!
This is a great method for simplified art styles, breaking things down into basic shapes like this has made a lot of things easier for me and it's a good habit to keep around for complicated bodyparts like feet or those horrible mutant flesh-spiders on our wrists we call hands.
The effort you put in really does show, though, so kudos for that! Keep going!
