SexyFighters.com

[hollow]

It's OK. At first I thought it worked like a slider puzzle, where you have to swap adjacent squares.

It might be fine with a picture that's hard to make out; like if there's a lot of the same color and texture all over the picture. (hint hint) Otherwise, it's too easy IMO. (Part of it was me knowing what this picture was already...)

I suppose you could put a time limit you have to beat in order to get the full-size version. In that case, people would find themselves getting very familiar with the picture anyway, in order to place tiles quickly, so I would also make the puzzle picture a relatively small portion of the reward.