Ying Yang Cats

I have re drawn the Ying Yang Cats in brush pen and drew it bigger, because before it was just a small sketch. I've worked into a bit on photoshop with different line colours and backgrounds. I think I like the blue lines with the white or light blue background the best, its a calm and relaxed colour which works well with the drawing. 

Or this is what its line just plain black and white? Which also works well, but the blue lines makes it pop more.