New Dragonborn Leina

Cool! Is that a custom face paint?

It is and it isn't.

I am using the RaceMenu mod, one of it's features allows you to turn the colour on for all available war paints, it also has a section that lets you use some other races war paints. I have 3 active warpaints right now, one breton, one imperial female, and one orc female.

Combined they create a custom paint job however its just clever use of existing designs.