Step 1 – Product Images on Sales Order line 

On odoo admin panel, Navigate to Sales > Quotation ;Open Quotation

In Quotation users can see product images on sale order line. 

Step 2 – Product Images on Purchase Order line

On odoo admin panel, Navigate to Purchase > Request for Quotation ;Open RFQ

In RFQ users can see product images on the purchase order line.

Step 3 – Product Images on Product Tree View

On odoo admin panel, Navigate to Sales > Products ;Open Product Tree View

In product tree view users can see product images.

Step 4 – Product Images on Product Variant Tree View 

On odoo admin panel, Navigate to Sales > Products->Product Variant 

Open Product Variant Tree View

In product variant tree view users can see product images.