Besides it's my last day on vacation, so might as well make some good memories.
I'm not exactly sure why I drew this (other than butts being obviously relevant to my interests), I just felt like practicing a bit. Drawing a set like this is much easier than compiling a pose practice. I draw these from imagination so the anatomy may not be quite in place. I think I spent around 4-5 hours on this, so that makes 16-20 minutes per illustration.
As usual, I like to play with viewing angles. I like how #6. and #12. turned out. #1. and #11. are also quite fascinating. I was trying to draw a bit slimmer thighs than usual, but old habits die hard as they say.
I couldn't help but notice the difference between butt #8 and butt #9 besides the thighs. Could you elaborate more on what's going on with their butt cheeks? The wireframe on #8 seems more compressed while making an obvious oval shape while #9's wireframe seems more full blown. Is this signifying the amount of fat the butt has or is there something else that I'm missing here?
I believe that on #8 the forms derive from the actual muscle shapes, so the shapes are more firm (even with some fat tissue). On #9 There is more flesh and fat all around, so the butt is also larger and it extends all the way to the thighs (the widest part).
It's also possible that the shading and contour lines accentuate that oval shape too much.