Forgive me, I don't know any German besides "das
ist verbotten" (just because it gets said to me a
lot ^^;;), so you might have these already on the
page you are working on, but I thought I would
include them just in case:

Harmony cel:  Cel used in animation but mostly
painted on background stock with maybe a cel of
just black lines (like your mini-goddess Urd)

Tome cel: Cel that is held still longer than usual
in front of the camera

Keys