And I don't know, if this is part of this compilation... But in another scenario, there's a skinny boy who is supposed to be a doll? Artificial human? And his "master(?)" is supposed to be someone abusive, who abuses the boy.
One of these two maybe?
https://www.mangago.zone/read-manga/secret_fetish_anthology/
https://www.mangago.zone/read-manga/fetish_bl_anthology/
If not you can try searching through some tags like https://www.mangago.zone/tag/Hand%20fetish/?page=1
The hand sculptures one is definitely the second one, the Fetish BL Anthology, which is Lady Margarette's Secret Workshop. Thanks! (≧∀≦)
Glad to help~ Also for the other one I have no idea maybe you can find it from this tag
https://www.mangago.zone/tag/Humanoid/
It's a compilation of different very short scenarios, actually. One of the scenarios is about a guy who likes another guy's hands and makes... umm... white (or the same color as the other guy's hand) "hand sculptures(?)" of them. It's a colored manhwa/comic. I remember reading this, years ago.