I see no problem with the waist, it curves like a waist is supposed to given her position. Artist probably shouldn't have cut the lower leg portion out of the picture since it gives way to an awkward view but even then it's anatomically correct for the most part.
"Wasting" an appeal doesn't sound very confident for an appeal reason, I've to say. Personally, I think the hips are still ok, but the image as a whole is not really to my liking, either.