Hello there,
I'll try to cut through the "tickling producers can do no wrong" sentiment that seems to permeate some threads to give you my opinion (producers are human, so they're bound to produce questionnable clips).
The real problem with tickling is that it is all a matter of perspective. What one considers tickling, someone else sees it as faked.
I bought a lot of Chinese girls nylon tickling videos. I kept a number of them. I got rid of the ones that I didn't see as being real. If there was one criticism I could level at Chinese produced videos, is that some are very tame (can't think of a better word). It looks like they're not really getting tickled very hard, so they're not laughing very much, so it looks fake. However, this kind of tickling is very sexy at times.
It's your product. Simply try to make it as best as you can, and I do believe people will buy them in drove.
One last thing though. It's great that you post pictures, but on a 30 inch screen, they look really, really, really tiny (I mean really tiny). Anyway, have a great day.