There is nothing wrong with simple sketches! The are important.
Just wanted to comment that the shape language from 4 in the first post is indeed the best one. Those two points that come in towards the belly button seem off in the most recent sketch. I think that it might be making it look like the sides are bulging as if wearing too tight pants.
Looks fun though, I look forward to seeing the "cool drawings" you have indirectly promised.