while it is definitely a great picture conceptually, i think it's lacking in 'pounding down' the lines ... what i mean is, some of the lines are crisp and nice, elegant lines (the moons, her eyes...)

but the lines that had less time spent on them bring the picture down as a whole (her breast curve should be beautifully drawn to accentuate her beauty, but her body was drawn very unflattering ... her right arm also should be fully drawn in, not half under and half over the wing, and it should also have supremely elegant lines ...)

i find that the closest objects in a drawing should be the most 'solidified', because then you can let the rest of the drawing just fall into place ...