He looks like a normal to me. Pretty skinny.

Lets start off with this. One reason he may not eat is cuz hes stressed. This can be due to incorrect husbandry.

First off start by listing the following

What you keep him in.
His temps
His humidity
How you measure these
His hides
How your heating this enclosure

All these will be key to making sure he has the right things he needs so she is not stressed.