It's not that bad.
Covering both sides and the back would improve the look and security for your ball.
I would choose a theme and go with that. Like a jungle theme or something.
Like what Rachel said, some plants will add to the look.

The wooden half log hide isn't that great to use. They tend to mold after a while.
Two cave hides on both sides would look nice. And a little bit of friendly advice, the dial thermometers on the tank wall aren't very accurate. You can get 12$ digital thermometer that will measure both the hot side, cold side, and humidity from walmart