I really like what you did with the colors!
And, if you're already doing it digital, instead of line hatching you could try playing around with the colors and shades; similar to what you did with the red- and blue-tones, just even more pronounced (?).
And, if you're already doing it digital, instead of line hatching you could try playing around with the colors and shades; similar to what you did with the red- and blue-tones, just even more pronounced (?).