I'm not sure why, but I had Hulk on the brain over the weekend and I had to doodle some variations. Just pushin' shapes and proportions around. That Rhino was supposed to be a Hulk as well but maybe his head got too pointy? Not sure.
I should also say, while there are many parts to female superheroes that are fun to draw (wrists, kneecaps, earlobes, etc...), I think thick necks take the cake for dudes.