It actually looks like it may have a stuck shed, I'd give it a nice long soak to help get that shed off. Then keep really fresh water in a large water bowl to make sure the animal is hydrating properly. I would also advise collecting a fecal sample and having a vet test it for parasites as soon as it leaves one. It at least looks like it has been eating well. Hopefully it will stay healthy with proper care. I wish you luck with your new GTP.