First, do this eye base or something, then darken it with a not to dark color also making it as dark as you can until it's black but don't keep the black ( roller tool btw ), second you the use white paint roller and make circles until you get the white. While keeping the same color and tool, make a oval in the colors until it filled every type of the colors on your eye. Use the smallest color and just use a ref of what i did.

yw m8