Something about her right nipple (the left one from our perspective) seems just very slightly off to me in some way, but her left nipple (the right one from our perspective) is practically perfect. Kudos.
But I have to also point out that her left breast (the right one from our perspective) looks like it has an invisible rope. Probably a side-effect from simply erasing the ribbons, but it does look a little odd. As does just having the breasts just floating there, a side-effect of not having the hands. Without the extra work put in to have those things make sense, these alts are a little strange once you start examining them for too long. It's nice work overall, though.
Finally, the shading looks a bit strange between her eyes. Most of the shading elsewhere looks fine, but then the shading there sticks out and not in a good way. Possibly from being too black in tone, rather than just a darker shade of her skin color. I'm not sure. It's just that it kind of looks like some ink got splattered on her face.
All my nitpicking aside, this is a pretty great piece. I hope my critique isn't discouraging.