Here's a piece you haven't seen, and another which you have, but not this resolved. They're mostly for my previously mentioned pixar internship portfolio, but they're still really fun as just quick production painting challenges. I rarely let myself do pure character design, it's almost always something in the context of a scene, which I think strengthens the character overall, but is more time consuming.
The astronaut men took about 30-45 min a piece. I definitely got faster with each one I did.