It looks very noisy, I think you should add black into the mix of colors. Not just a color you use but a color you shade with. Don't be afraid to use solid blocks of color either.
The black parts look very separate from the colors, try blending that just a little so it's not so... disconnected I guess.
Looking forward to some more updates.
Ah, I forgot to mention, my first refs were the comic-in-the-comic in Watchmen... the shipwrecked guy's story. Which explains my lack of block colour beforehand.
I just had quick look at a Lichtenstein ref, and there are block colours. I'll use them.
I think introducing block colours will make the black seem less detached.
->Jad: is what I did in my update alright then? Or should I get rid of RGB and keep YMC to then create patterns to simulate RGB?
Anyway, thank you both for your support!
I'll be restarting from scratch, it was starting to get hard to work over it.