China Glaze Kinetic Candy is my favourite blue for skies--not super bright blue and with a touch of grey like a proper autumn sky. (I've also used it previously in my snowflake nails.) I personally don't like wearing brown as a nail colour, so I went with the closest thing in my stash for the branches, Revlon Colorstay Stormy Night, which is a little taupe-y. For the leaves, I sponged on Essie Tart Deco, Layla Ceramic Effect CE84, and Clinique 70° and Sunny.
What autumn/winter sights would you want to see in nail art?