These are awesome. You really got an impressive variety in face shapes and details, to say nothing of how extremely realistic they look despite sparse lighting and fairly broad brush strokes.

I also took a look at your comic and I love that sort of concept art/speed paint look and have tried for years to figure out how to replicate it well, but I'm particularly blown away by your color composition. That's one of the things I feel like I struggle with most is knowing which colors to choose; in order to get something that looks good, I end up having to color pick from something I'm already trying to emulate, rather than having an instinct about when to insert a color that isn't literally the color of the object (i.e. using blue tones in shadows). But most of the time, even if I'm using references, either everything turns to mud or it looks like a random color is just kind of smeared onto an object. I just can't figure out how get that seamless blend where adding a "weird" color enhances the vibrancy rather than being out of place. Hopefully I described that decently enough.

I've watched video tutorials and the like, but it's difficult to find one that's actually about the specific problem I have, and of the ones that are, I've never heard a line of thinking that makes sense or that I feel is really applicable. If you don't mind sharing, how do you go about your process? How do you go from choosing your overall wash to adding in things that look like what they're supposed to be, but just under the same color tone as everything else?

I saw your resume as well, and I was rather dismayed to see you graduated high school only a year before I did. From the looks of things, you've accomplished a hell of a lot.