As you can see I kinda abandoned the pink girl for this gal who showed up in my journal last night. I am finding that one neocolor II crayon and some white gesso is a fun quick way to paint a face. And of course I would guess that it could work for anything you want to draw. I may try this technique with some other sketching of hearts, figures, or some whimsy.
I drew the face out quickly using the crayon to fill in the darkest areas, then sprayed some water over the whole page which activates the them quite nicely. while that was still a bit wet I went back in with the white gesso to blend the crayon. This was a back and forth process between the adding crayon and then gesso till I got the contrast I liked. As you can see I also added some scratches while everything was wet to grunge it up a bit. The color I used was prussian blue. I have to say though that the gesso dries very quickly so next time I may sub in titanium white acrylic instead.
Would love to hear what you like to use for quick face painting!