Many books will feature good illustrations that will help you identify or place your artifact in context.  Use the Library of Congress subject subheading, "pictorial works"  to find those books that contain images.  You can use "pictorial works" as a keyword phrase when searching the catalog in combination with other relevant topical keywords, or use specific LC subject headiings that include the subheading "pictorial works." Other LC subjeadings that will be useful for identifying image rich sources are "Catalogs" and "Exhibitions," since these subheadings will retrieve museum publications.  See the sample Library of Congress subject headings below:

Indians of North America--Pictorial works--History

Indians of North America--Material culture--Exhibitions

Indians--Antiquities--Catalogs

Indian pottery--North America--Exhibitions

Navajo textile fabrics--Catalogs

Textile fabrics--Africa--Exhibitions

Indian pottery--Mexico--Exhibitions