I don't like pure black as the final shade but personal opinions behind, I think the white in the first one coul use more contrast. The design is pretty solid though. Also... I think there's something wrong with the muzzle? I can't put my finger on what but it looks weird to me.
The robot looks decent enough, I really wish it was easier to make Emerl's head not look like Emerl, but yeah. It's eyes also seem weird but are weird in a way that I like it.
Both designs are pretty simple but solid and are executed pretty well, imo. The shading seem a little cluttered in some areas but is overall outstanding, aside from opinions on the black as I've said before.