He actually seems pretty good size for the half logs. If you want to, you could get like black construction paper, cut it to fit the front of the half log and make a little entrance way. I've seen someone else do it for when they couldn't afford new hides. also, you might want to cover up the sides and the back of the tank with a black construction paper, or cork board for added insulation.

Edit: And every BP is different. I didn't think my BP was the sharpest crayon in the box, til I fixed her husbandry