4. Ruffled Bells
Add veins in each leaf with two curving lines down the center. Give the flower bells ruffled edges by drawing the bottom of each bell as a scalloped line.
Add a second scalloped line to show that the petals are turning up. For the bells that are tilted toward you, draw the bottom as a circle inside a scalloped circle. Draw tiny, tear-shaped centers in the bells that are the most tilted.