Looks like it's a painting by Arthur Hughes.
https://www.toledomuseum.org/about/news/art-minute-arthur-hughes-ophelia-%E2%80%9Cand-he-will-not-come-back-again%E2%80%9D
I still have the same face I started with, but I've changed it quite a bit over my journey through the Tower to reflect my "status."
I just browsed deviant art for hours until I found one that I liked. Her face captured me instantly. The artist has actually done some other people's avatars, too...