Interior graphics and signage.

Interior graphics and signage can be used to show a brand or specific products, 
identify classifications of product within your store, and, depending on the size of your store, offer direction to various departments. As well as educate customers by announcing a sale, promotion or discount. 
If you are selling a brand-recognized product like Lenox china or Calvin Klein watches, it may be beneficial to highlight that product with a small strategically placed sign of their logo near the product. 

Repeated or related photos can be used throughout the store to reinforce a scheme  or an overall look.  They can set the scene for a special event, or season such as back to School, summer or Christmas.

Remember that the merchandise is the main focal point and that signage is meant to enhance your presentation.

Window Graphics and signage.

Window Graphics and signage can be used to educate customers about the merchandise for sale, announce special promotions or to direct traffic flow through your store. Graphics and signage should present level of quality.
Many stores use large posters, photo enlargements or other large graphics in their windows with items placed near-by. (over sized graphics are currently a popular display prop because recent technological advancements have reduced the cost of producing them.)

Repetition of large graphics in one window, various windows or throughout the store in various sizes is a good way to carry w window sceam in to the store as well as it serves as a reminder of a particular product,
creates a dramatic effect and draws your customer from the window through the store.

Large graphics can reflect product style. For instance, you could use a blow-up of a Monet floral painting behind a display of floral merchandise. For added impact, repeat that Monet graphic within your store near the merchandise for sale. If your store sells children's products, like educational toys, you could use a blow-up of a little red schoolhouse or a college campus as a backdrop for the merchandise.