Hey Janar, you've done so much already, wauw. Also I think it's quiet amazing you could manage some of these exercises being color blind. I found them pretty challenging myself at least =P. Keep it up! Hope to see more of your work coming up!
P.S. By the way, if I'm not mistaken there are artists that work almost exclusively in greyscale. Google 'Anthony Jones' for instance, his work is almost all in tones of grey!