As you see in the post title, red, yellow and green are this week's 40 Great Nail Art Ideas Challenge colors. My personal pattern prompt is watercolors.
I started with a white base (two coats of P2 So Innocent), then thinned down my color polishes (red: Essence Juicy Love, yellow: Catrice Earnie And Birdie, green: Essence In The Jungle) with acetone and dabbed them on my nails. Then I dabbed a brush dipped in acetone over the lines where the colors meet to blur them even more. One coat of KBShimmer Clearly On Top finished this mani.