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