First of all, this drawing is so cute!! I love her eyes and how they shine, and her costume is so adorable!! Great work!!
What could be tweaked a bit are her ears and wings, maybe they could be angled a bit more to create more of a 3D effect. (Don't worry, we all have these mistakes It's part of learning, right?) Also, her tail is a little too short and wobbly. Perhaps you could have made it longer and less...squigly? Lol, overall I think this is awesome!! I can tell you will be a GREAT artist someday!!