Can’ see color? Don’t use color!A great painting medium that doesn’t use any color is pen and ink. It’s also pretty cheap to get into as all you need is some paper and a pen.
The value in understanding valueThe color value of different objects tell you a lot about how far away they are and about their position relative to each other.
Technology is your friend. There are countless apps to help you get the name of the colors you can’t see.A great one I use is Color Blind Pal on Android.
Painted a pink sky or orange grass by accident? No problem, just pretend you meant to do this from the very beginning. It’s art and if people don’t like it they just don’tget it.