I like to keep my snakes on the heavy side, mainly because I had one snake fast for eight months straight. Good thing she was on the heavy side because at the end of the fast she still looked good. I had one snake that was underweight and she fasted for a long time, scared the heck out of me, I was tempted to assist feed (although I didn't and wouldn't). I don't think the snakes above look overweight, they are just big! Plus I'm feeding to breed, if I were feeding a pet snake I would never feed that much.