So justinoaksford gave me the good suggestion of throwing some light and shade on my flats, and I’m glad I did! He outlined a nice and simple method for doing so in the .pdf in his post for his Digipen students here. It’s essentially just using a cool tone on a multiply layer for the shadow and a yellow on overlay for the light. Pleasing results, and no rendering necessary! Decided to push the light a little bit, because I imagine them living in a world perpetually in the golden hour. Thanks, Justin!