General:
* Pictured
* Depicted
* Shown
* Presented
* Explained
* Clarified
More specific:
* Drawn (for drawings)
* Painted (for paintings)
* Photographed (for photographs)
* Engraved (for engravings)
* Sketched (for sketches)
* Diagrammed (for diagrams)
Figurative:
* Enlivened
* Enhanced
* Made vivid
* Visualized
The best word to use depends on the specific context and the type of illustration being referred to.