I'm trying a slightly different approach to coloring this image - normally I do it all in Illustrator, but it can be rather time-consuming to color and properly order the inks, and then create the color fills. I thought it'd be quicker to color the inks in Photoshop instead, but so far it feels like it's taking just as long. After separating the inks in separate colors in CMYK mode, I copied the later and started filling everything in. These fills will be used as masks for the actual colors, later.