This module is developed to see the product images in tree view and report. Make sure to install the web_tree_image Module from OCA.

You can see the below image of sale order/quotation having product's image.

To display images of product in report, you need to tick print image and image size you want to display in report.

See the below image with small product size in report.

See the below image with medium product size in report.

See the below image with large product size in report.