I agree with the advice in this thread. I would make the thumbs larger. Zoom in on "the focus" of the pic... I use 120x160...
I like to match the color/design of my gallery to the colors/design used on the tour so the surfer doesn't feel like they are "going some where else", not sure if that makes sense.
The "click here" link could be bigger I think.
I try to use something animated when I can.
Other than that, I would consider it "clean" but not too simple
