Hello,
Very nice start! Two things caught my eye and I think they will greatly improve your piece.
First of all, the wings don't align with the body properly. You chose a pose that's somewhat facing away from the viewer and the wings are drawn in a perspective towards the viewer directly. You could google for some reference pictures on this.
I would also suggest avoiding shading the wings with black/grey, which brings me to the other thing.
Another thing I noticed is your coloring. They seem kind of bland right now and there's not really much variety in them to catch the viewers eye. There's a lot of the same tones in it and is missing some contrast.
Going to link some video's with this that might (hopefully) help you (because I am bad at explaining it and I personally believe that seeing examples helps you learn a lot).
Color Basics
Skin Tones
