Okay my post was being typed while you were posting....
He doesn't look emaciated, but he is on the skinny side. I would still do another soak at some point today or tomorrow to help hydrate him a bit more and make sure he has a nice humidity level in his tub for now.
I think you can still try a fuzzy for him, but do be careful with upsizing too quickly because the point about him not being used to it and possible regurge still stands.
He definitely is a cute little one though so I hope once he's hydrated and has a few more calories he'll start doing better.