Getting to the point of not being able to tell it started in black and white is very challenging. Its one of those things that usually turns me off a lot in art is when I can clearly tell it had color overlays instead of true color. I dont think you're there yet, but keep pushing.



Have you tried any variation on the technique of laying in flats and using a multiply layer on top of a solid color and masking out your lighting? Thats one I've found super helpful, especially for designs with intricate patterns.