First take some bright but darker shades of paint, and using a scraper, cover your page.
Now do a little background stamping, just use a geometric shape of some sort.
Add some lighter shades of paint, using a brayer and bottle caps.
Rough out your face, ad paint in the outlines using white and a fine brush, or you could use a white sharpie pen. Then white out all the background. if you are not confident at drawing a face then cut one from a magazine and draw around it. Cut each section of face out and draw in the main outlines.
Go around your white shapes with a black pen.
You could leave it as in the photo above, but I added some crosshatching and a border.