u could add some plants in there for more aesthetics, and putt in some moss for him to get in and under a humid spot--keep the moss moist.
he needs a hidebox too.
also make sure that rock is sunk down to glass so that the snake cant burrow under it and get crushed. i t would be good if u could shave the bottom of the rock so its smooth and flat so its more stable.
and u could get a lower water dish for easier access