Went a bit lazy on this one with the testing having put more focus on the mystical high collar lora, perhaps others can share their images of this one. Lil finnicky but it works.
Lora Weight 1.1, Clip Skip 2
Trigger Word: ffhalfmask
General: half mask
Side of Face Masked (Has A Bias Towards The Left Side): ffmaskleft OR ffmaskright
Mask Size: halfmasksmall OR halfmasklarge
Color (Red Has Bias Towards Adding A Horn): [COLOR] half mask
Half Mask Horn: horned mask
Mask Over Hair: half mask over hair
Mask Over The Eye: half mask over eye
A Particularly Evil Mask Over The Eye: evileyehalfmask
(Large) Mask Over Part of The Mouth: mouthhalfmask
Now I disappear until I think of more ideas.