For three of the sansevieria leaves, draw an edge by drawing a third line that follows the curve of the other two. Draw a center vein in most of the palm leaves with one line down the center.
Draw a vein in each of the violet leaves with two lines down the center.
For the veins in the ivy leaves, draw two lines coming together at the center, then continue the vein with one line. Add the stems for the violets. Draw the ivy stems with curving lines.