I've never heard of colour blindness being linked to artistic ability.
I 'suffer' from a medium degree of blue-green deficiency and [used to] dance, sing, play 3 instruments very well and others mediocre, and I am lucky enough to be able to paint any object so that it is actually recognised by others.
I believe the blue-green one is very common and is present in at least quarter of the european males to some degree. Very few people are completely colour blind to the degree that they see everything in black and grey.