Attach a flower square to the flower nail with a little icing. Using a decorating bag fitted with tip 8, pipe a mound of icing to form the center of the sunflower. Pipe the mound as wide as you like.
Switch to a bag fitted with tip 352. Pipe a row of leaves around the bottom of the mound, turning the flower nail to create a row of outer petals. Pipe a second row, staggering petals on top of the first row to create a fuller look.
Switch to a decorating bag fitted with tip 18. Hold the bag straight up and pipe stars to create a texture effect on the mound of the sunflower.