I like the arrangement of the set-up, but.... ditch the gravel! The overhead light is not really necessary with an under tank heater (UTH), too. Do you know what the surface temperatures are on the warm side of your set up?
Gravel,sand,bark,anything loose like that is BAD!!!!!!!!!!!!!!!!!!!!!!!!It can make the leo become impacted.I guess you could compare it to us being so constipated that we die.Slowly.That is like a leo.I use repitle carpet and I think that it would look great im your cage.You could get some green.Also if you don't want to attrive a very good look then you could use paper towels.Just don't use anything lose.And DONT listen to petshops.