The still is from a Harmony release called "The Barefoot Alien", from their BF series that was written and directed by Jon Woods. Whatever pics there are would've been printed in one of their magazines of the time.
Actually, there is no tickling in the vid. My memory is sketchy, and I didn't work on this production, but IIRC, she's performing something like the Vulcan mind-meld. Shame, because the redhead, Sabrina Stone, was incredibly ticklish, as was the other model, whose name escapes me.
I checked the Harmony site and they don't offer this title for sale anymore. They do have the sequel, "The Barefoot Alien 2: The Foot Erotic", which I did principal videography on, but there is no tickling in that release either, as I remember.