Keep iving him baths several times a week, and don't stop once he recovers. When I saw his picture, dehydration was the forst thing that popped into my head, although there are other things that could cause a beardie to look like this.
There is a good forum where beardie people can help guide you in taking care of him.
It's Beardeddragon.org. It was super active about 8-10 years ago, but there are still people keeping it going. It's sort of a BYC type board for bearded dragons. Lots of good reading there!