the fold on his neck is normal but the folding on his sides is a little odd. i'm not sure if it's dehydration or not--he doesn't appear malnurished or anything. maybe give him a 10 minute or so soak in some lukewarm water and see if that helps. do his eyes appear sunken in at all?
that's possible--that it's just the way he is stretched up. i was thinking of getting out my leo and holding him in different positions to see if his skin did something similar but he's all asleep so i figured i wouldn't annoy him at the moment.
He does look dehydrated and fairly underweight. He will have a much better chance at improving his condition if you rethink your substrate choice, as mentioned in the other thread. I wish you the best of luck with your new addition though!