Normally I don't like fakes but this one is pretty well done. The reason I don't like fakes for the most part is because:
1. Most of them are very poorly done
2. When you've been online looking at tickling and foot fetish media for several years you begin to recognize a set of stocks, a pair of feet, photos in general.
3. Given 1 & 2 above...when you know it's fake it just kills the arousal because it's just "too much of a fantasy" if that makes any sense...kinda like why I prefer the non-celeb stories.
However, having said the above, I must say that this image is really well done. The only thing that needs to be done is some better skin-tone matching. Other than that, great job!
- DFT