She is awesome! The design of human\bird is pretty well blended, and the simple, but in-depth background really takes the cake especially in terms of color scheme. And Oh god, why did you have to tell about her taking a shit in the chimney! XD
I love harpies, and this art caught my attention very quickly! I think you captured the mysterious and dangerous essence of this fantasy bird of prey very nicely! With everything, your style, the color choice of the environment, and the body language of the character. I like how the yellow eyes make a nice contrast to the cool blue-turquoise color tones around, too. And how you show that a full moon can manage to make naked trees look a little dreadful. They're almost formed like the harpy's talons, which I think fits very nicely.
Also I need to add I really love tiled rooves, I find them fun places for characters to.. be on. I don't know why, maybe because their texture is interesting for me. It's an adventure to walk on such rooves.
(*reads description* Haha "taking a dump in the chimney", now I can't unsee it either. xD