If anyone orders them, keep in mind the actual drawing area's less than 2.5 x 3.5 inches. I.e.- if you request something like, "The A-team fighting a dinosaur on a meteor smashing into the earth", you're pretty much gonna be getting stick figures and dots and stuff.
Also, the drawing material will be discretionary. Most of them will probably be finished with pen and ink, but if I think the drawing holds up well enough or it might turn out better, some may just be pencil. Sometimes a little watercolor maybe, who knows.
Here are a few examples of what to expect-
If you want one (or ten), order them in the store.