Displaying Product Image on the Sales Screen
You can configure various sales-related settings by visiting the Configuration>System Configuration>Sales tab.
On the sales tab there is another important setting that can be used to display product images on the sales and return screen.
NOTE: to display images on the sales screen, make sure images are attached to items on the item definition screen
Go to Configuration>System Configuration>Sales
Mark the checkbox Display Image on item scanning
Now when you scan an item on the sales and return screen, the image of the scanned item will be displayed along with the scanned item.