Looks like the injury is healing OK, but in order to heal better he needs nutrition too. If he was at my house, I'd tube-feed him thinned Gerber's chicken
baby food w/ reptile vits added; it's fairly easy to do & very digestible... Poor little guy! I'm so glad he has you to watch over him.
In those first pictures his head looks so big compared to his skinny neck! But at least he's hanging in there...thank you for the update...I'll keep him in
my good thoughts for sure.