Who has blue like that in their homes? Seriously. What are  you looking to sell? No one will buy that in a 30x40 as it will totally clash with their decor. White, black, browns all go in people's homes. 
I love vibrant pinks, turqouise and other colors for fun.  No one buys them. Not the way they do the white, gray, brown. 
I shoot to sell.  Warm colors sell.  The black and white dog looks fine on that color, I still don't like it. It can't be hung anywhere.