The harpie is very nicely detailed and her wings, hair, tail, and feet have a nice vivid sharpness to them. Her skin tone goes well together with the color of her hair, feathers, and tail. She is a very well constructed and bold painting, for the most part.
A couple of small issues lie here, unfortunately. Her breasts are disproportionate, for one. Her left breast is bigger than her right one. Also, I have a feeling you intended to draw them that way, but her wings are disproportionate as well. They should be the same length to look more well done.
I really do like how you designed her and I'd love to see more harpie paintings from you!