Here's some Priscilla stuff, because I think she counts as a monster girl enough. Also, the third image features no tickling, but it really got me thinking about a whole tickling scenario involving that huge great white shark mermaid, and I actually might commission someone to draw it out sometime soon. The artist describes this picture as "a bunch of pesky remora mermaids hitching a ride on a white shark". So basically I was thinking, what if those "pesky remoras" decide to get extra mischievous and attach themselves to the white shark, then start tickling her all over? The poor great white wouldn't be able to get the remoras off of her, but she would feel all their dozens of little fingers relentlessly tickling all over all of her sensitive spots. She'd be helpless against the remoras' tickle attack, unable to do anything but thrash about and laugh uncontrollably until the devilish little mermaids get bored. To make matters worse, all the commotion might attract the attention of some squids or octopi, and I'm sure you know how THAT will go... and who knows, if it goes on long enough, the poor great white might even end up chained to a rock, with all manner of different sea creatures ganging up on her. It would be pretty amusing to see one of the biggest, baddest, most powerful apex predators in the sea getting tickle bullied by a bunch of little critters less than a tenth her size.
Also, for those interested, no, there is no uncensored version out there. The artist says he has it, and that he likes making people live with the knowledge that only he has the unedited versions of his art and only he can decide whether to share it or not.