Now that I've finished all 56 cards for the Star Wars 30th Anniversary set for TOPPS:
Here's a quick look on how I determine which markers to use for certain subjects.
First, a rough sketch of the subject, without overly focusing on actual representation.
I label each marker swatch so that it is much easier to make decisions down the road.
I eventually pick some of the colors but not all. The color guide will also let you know which
colors do not look good beside another color, even if they look appropriate when isolated.
Colors tend to influence how other colors are perceived by the eye.
Compare to actual 3PO cardAll the cards are standard trading card size, so the images here are much larger.