Looking at it for a while I see stuck shed and scrapes down the back.
I'd try a soak in warm water ( around 86f - and only deep enough to come half way up his body. about 20 minutes is long enough to start to loosten the skin) and then trying to remove the shed from his head and back so you can get a better idea of what you are dealing with. Then you will be in a better position to judge his overall condition.