Requesting nude edit
I'm not sure if these are the best references for the nipples, but they are by the same artist and I tried to find ones that had roughly the same shape and weight to them. Specifically,
https://files.catbox.moe/8yzziy.jpgFor the girl on the left
https://files.catbox.moe/p26ajv.jpg(specifically, the right nipple of the girl on the right) for the girl on the right.
You might need to play with them a bit to get them just right, I don't know.
