I call the first one "zoogenic furry" ("from-animal") and the second "anthropogenic furry" ("from-human"). The unknown one is either taur or semi-anthro, which is an e621 tag. A talking intelligent feral that can walk on its hind legs.
If I had to take that as a commission because I needed the money, for the human I'd make the skin my own skin color and draw it as myself shitting, then after that was done spend 30 seconds with the saturation/lightness slider to change it to the commissioner's skin color. When I browse scat art I see that black guy inserting his human character into scat ych's, luckily of no artists I like.