Search any topic; try adding in art or pictorial works if you get too many items otherwise.
Search StyleCat, The FIT Library's online catalog using a word or phrase describing your topic and adding the phrase "pictorial works" or "in art" to find books that are highly illustrated.
For example: stores will get you books that might have some photos, charts or illustrations, but stores pictorial works will list those that are the most heavily illustrated. "Mythology in art" will definitely find illustrated books; "mythology" books might be mostly or only text.
In the StyleCat record for a book, the field marked "description" might indicated "plates", "ill." or "illus." (illustrated or illustrations) and "chiefly ill." means the book is mostly visuals.
Of course for some topics--such as designers, artists, art movements--virtually all the books we have contain images, so don't worry if you can't find anything labeled "pictorial works".
Items that are listed as being in the Library's Art Reference rooms are pretty much guaranteed to have good images and/or illustrations. Of course other locations in the library may have what you need , but Art Reference is a good relatively-small collection to get you started.