This is going to be a long response.
I myself, am an Alois cosplayer.
From my personal experiences,
Because anime people tend to have large eyes, White eyeliner on your water line sort of creates a slightly larger eye illusion, than some black mascara on your bottom eyelashes because that's kinda important.. Next some people use the white eyeliner in the corner of their eyes too maybe a light eyeshadow? Also fake lashes but not ridiculous ones... just... no. >.<
Than I do a black liquid eyeliner. And wing it out because of the corner of anime people's eyes.
Yeah.. I know they are males and really you shouldn't need makeup for that,
But you'd be surprised how well it turns out
That's a really good reference video..
Sorry if this is just a weird response but it works for me so erm.. yeah