User blog comment:Mandiga/WINNERS! - Mandiga's Clawsmas Competition! ^^/@comment-13187859-20131223180817/@comment-7026120-20131226102155

Well, I'm no expert but I'd sudgest that you mark the painting and the fill the areas with a slightly darker or lighter color as shown in the example I made trying to see how it look. I think it turned out pretty well! ^^