I have made variety of leaves using some techniques. the first one from the top is my idea to make the 3D center of the leaf, and I have applied the same idea to make multi-center stem for the vine leaf as you see in the second picture from the top. That small thin lines is not my idea it is known one; I have made it using the kindle flame.
The third one which in the bottom I have just added some embroidery stitch-stem one-to the leaf to make the thin lines using another color.
The forth one is my idea too to make a leaf which lean to the bottom.
All those techniques to add a 3D effect on the leaves, or it is the beginning to do that.