Its been years since I owned a water dragon , looks nice and tame already they can be a nightmare very skittish . He does look a little skinny , what's current diet ? Mine used to love crickets mealworms earthworms etc , mine only ate fruit and veg when he seemed really hungry so best way to add nutrition is to feed the insects up with fruit before feeding to the dragon (same principle for pellet training fish off live food really )
Make sure there's plenty of moisture in the tank they need a lot of humidity , and a nice deep pool goes down well if you've got room in the tank , I used a large/deep food container and covered the outside of it with pebbles , couple inside so its easy to climb out
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