For the left-hand tulip, draw the outside petals with two wavy lines that curve downward toward the stem. Draw the inner petals with wavy lines. For the right-hand tulip, draw a center outside petal as a large oval.
Show that the petal is turning over by drawing another wavy line at the top. Draw in the remaining petals with wavy lines. Draw two tiny ovals for the center.
Show that the leaves are folded over by drawing curving lines for the front edges.