I purchased some Paper Clay awhile back with the intent of using it to sculpt a new figure. Well, I am doing that... however... I'm using it to alter my first full-size figure, "Jackie". I have a request for an Asian character, so I decided to use a "Jackie" cast as my armature. I'll do the other eye, then make changes to his nose. I may think up a few more transforming features. After he's completed, I'll have a mold made, then make castings of my Asian character.
I really like the Paper Clay. I've always sculpted with Magic-Sculpt, but it hardens quickly. (I call it "speed-sculpting"). Paper Clay stays pliable for a long time and takes 2-3 days to air-dry completely. Then I'll sand the eye nice and smooth. I may try it out to fill imperfections in the casting, too.