Original reference is here:
[link] The final drawing was done from a sketch of the photo versus the photo itself, as well as some (slightly depressing) photos of dissected rats. Rats have... interesting thoraic muscles, and I'm not sure that I'm quite portraying them properly. I feel like I need to get a hairless rat just to study.
Medium: Graphite, red wine, and coloured ink
Artwork is © *
MoonsongWolf
Probably there are some artists who draw / design that, too. Maybe you could use something like that as reference to learn ?
But that is a good suggestion, maybe someone does have skinless models somewhere in natural poses! Thank you for mentioning it; I will remember to look more thoroughly to see if I can find something similar.