Loved the character and the movie, so I did a little study a while back and liked it, so I wanted to push her as far as I could.
First time with Xgen ( and groom in general ).
Everything was done by hand, no maps where used, sculpt/texture done in Zbrush, render in maya Arnold.
When I'm sculpting likeness, I never put any of the references in the background or as images planes, I put them on the side and try to determine with my own eyes what works and what doesn't.