Just looked him up…oooh, I like that “Living at Lake Quaig.” Very Burtonesque. ^_^
Also, I don’t know if you’ve already heard of it, but you should check out ConceptArt.org. I’ve only started being active there recently, but I’ve found it an amazing resource to help develop my skills.
I just checked and I realized that Photoshop calls it “Flip” instead of “Reflect”…you should see it there right at the bottom of the Transform menu. 🙂