The best nail shape for sunflower nails is square or coffin. Both nail shapes will look good with a floral pattern, depending on the length of your nails. If you like to keep your nails short, a square shape is best. If you like to keep your nails long, a coffin shape is best. The coffin shape looks boujee and adding sunflowers to this shape will make your nails look real. Before painting sunflowers on your nails, you can leave the background transparent or white to keep everything balanced. Or you can choose a pastel background for a more modern look. A sunflower design would look lovely in pastel pink, green and blue.