How many items should be in my cornsnake tank?? advice PLEASE?

i have a liitle log.. skull, coconut hut and a shoeboc top... its a 20 gallon tank.. but still seems a little empty..











hes just a baby still.. and isnt it that if the tank is big.. with not alot of stuff.. the snake can stress out and die??How many items should be in my cornsnake tank?? advice PLEASE?
you have plenty of stuff in there..frankly they dont need more than a place to hide, a waterbowl big enough to soak in and a warm spot to bask..they dont have the mental capacity to need entertainment..anything fancy is more for humans to look at than for a snake to utilize..but you might want to put a plasma t.v. in for him just in case...lol good luck with your snake