Enclosure setup and general advice

I recently got an adult rosy boa along with his tank (36x18x12) and decorations. So far I’ve added the cork branch (which he seems to LOVE) and replaced the half log hide (still in the enclosure, just on the cool side) with a box. I’m asking for general terrarium advice. Is the open space near the front of the tank ok, or should I aim to clutter it more? Is there anything else I should keep an eye on? Thanks!