I did some subtractive mods on an extra Batchix Nan Sook head recently. I think Nan Sook is inherently adorable, but I wanted Sheila to look at least slightly different from Chaz, who is an unmodded Nan Sook. Another unmodded head is at left for comparison, while Sheila is at right. I sanded down the depth of her eyelids and eye sockets. I also removed some of the tip of her nose. Finally I made her mouth deeper, straighter and wider. Ultimately I think most of the differentiation between Chaz and Sheila will derive from faceup, eyes, clothes, characterization and the fact that they will never appear in the same frame together.