You have done a really nice job with your setup. I have a suggestion for you that really helped give my tank a natural look. You may have already seen them. Check out this background.

http://www.reptilesupply.com/product...oducts_id=1565

I love it in mine. I have a 30 gallon tank so i had to buy two of the 18x24" and had to make some modifications. The only problem I have had with it is that my BP will get behind it. I took some styrofoam pipe insulation tubing and ran it across the top to prevent him from getting behind it. Then I took some fake vines to run across that to make it blend in. Just something you might want to look into. I use it in both my ball python and leopard gecko tanks.