Sketches, illustrations (8)
I believe the answer is:
drawings
I believe this is a double definition.
'sketches' is the first definition.
(I've seen this before)
'illustrations' is the second definition.
(I've seen this before)
(Other definitions for drawings that I've seen before include "Illustrations, draft plans" , "Sketches or draughts" , "Illustrations by hand" , "Cleaned with water" .)