Sometimes if you mist the enclosure prior to offering food they will eat. You could try a warm pedialyte bath and see if it helps. sometimes they'll eat after have one of these medicated baths, but its not a foolproof solution to the problem. If you have any Repta-Aid(Repta-Boost) place a couple scoops in the pedialyte bath to provide some nutrients and vitamins to be absorbed so he isn't deprived completely of them. You'll want to do a second bath of just de-chlorinated water afterwards to rinse off the Repta-Aid(Repta-Boost) to prevent bacteria and fungi from growing on his skin.
Also from those photos I can't tell whether you have 3 sides of his enclosure covered. If not you need to do so. What kind of heating and lighting are you using? Do you have the lid of the enclosure covered 3/4 of the way with plastic wrap(Sarah Wrap) to hold in heat and humidity? Your gauges look like they're just leaning against the back wall of the enclosure. they should be elevated above the substrate by 1" to 1.5" so you get a more accurate average reading.
Try this and keep me posted.