Usually, I do not modify the shape of my liquid sculptures in Photoshop, but only adjust colours, contrast etc. and eliminate disturbing little droplets.
However, sometimes it can be interesting to take only one half of a picture and flip it over, creating a symmetric image. In this gallery, you can see some of my first attempts. The "Fortune-Teller" was a little bit more complex: I created two mirrored images from the left and right sides of the original shot, and then combined them to form the head (from one side) and the body with hands (from the other side).