Here are some example of Charles Harper’s illustrations.

More about leaf shapes are here.  And here. The image above is in Course Folder as Illustrator doc: leaf

Please identify the botanical names of leaves you are using – post a better resource if you find one.

download Kimberly Elam’s book on graphic translation: grtrans_eb

JK Rowling portrait translation

Illustration by Charles Burns from his graphic novel, Hole.

Geoff McFetridge.

A page of leaf structure studies: leaf Studies2