haha yeah it is difficult, if you look carefully - its not actually lined up very well!

I was hoping noone would notice. But I get what you mean, it can be hard. Try quickly sketching out the big shapes in the drawing on half the picture - then grab that half, and flip it over. You'll get a nice symmetrical outline. Then its just a matter of back and forth between viewing your head in toribash (or on another cylinder), and painting!

Very nice head corza, your name sounds familiar for some reason, I've seen a few of your works im sure of it.

How would you go about coloring on a grayscale?

I love these! Many color options.
There is nothing that I don't like about these. Except they look sketchy.
9/10