Depends on the figure and how way too skinny they are.
If they are...well...looking like a skeleton and as if they are going to fall apart any second...then it isn't really nice right?
If they are making themselves too skinny, then yes. I'm a girl, and I think girls are way prettier whenever they can actually fill themselves out. But you may not know, it could be a girl like me. Genetically skinny, and trying to put weight on.