Finally a use for the white crayon! GIF

He drew it out with white crayon first

Please explain.

Funny. That's the same thing I saw whenever I witness doubled boobs.

can NOT unsee...

I think the white crayon is the eyes

They could have drawn around it with white crayon to keep the water and ink in that area

That's what I was thinking

True but crayons don't leave such a crisp line. The parts that are left white were probably just purposely left dry. Or maybe this whole art is just made with magic, that could be a possibility too!