Interesting
Overall this is a good drawing, but there are several things that jump out to my eye that require improvement. I won't comment on the pose or subject because that's all up to you, but here's a couple of things that would enhance the drawing itself.
First off, the anatomy needs some touch ups, especially (!!!) in the crotch area, where the legs merge together and part of the bum starts showing up on the inside of both thighs. That should only be visible if the angle of the camera is extremely low and looking up, which is not the case; the way the bum is attached to the leg is pretty much as if the leg was viewed from the side. You should touch up that pelvic area! As for the rest of the body, it's mostly good except for the wings, which lack definition and structure. Look at birds for reference. You will see that all feathers differ in size and shape, and together they form a very distinct structure, without the underlying bone structure being obvious (such as in your drawing) . The lineart in wings should suggest feathers, not bones covered in feathers.
I do like the way you rendered scales and the gloss on the tail, but the remarquable effect you got on those materials is dampened by the less dramatic effect you achieved on the fabric, hair and feathers. Learning to paint different materials and textures efficiently takes a lot of time and practice, but looking at your progression you seem to be learning from your mistakes.
Keep drawing! You definitely seem more skilled with a tablet than I was at your age, if you are indeed 17. Study feathers, paint a lot of hair, watch how fabric drapes and always practice your anatomy!