How to add Product image field to view
This drives me nuts in Drupal Commerce. Now that you have the relationship, add a field to your view Content:Path using the relationship and tick boxes for Exclude from display then go to Rewrite results and tick the box next to Use absolute link (begins with "http://"). Move this field so that it appears above your image field. Then, in your image field, Link image to [Nothing] and under Rewrite results tick Output this field as a link and under Link path enter the token for your path. 

Good luck.