I don't think that OSM is the right place for reviews, ratings and images of containing offers from stores. There are dedicated platforms for this, but a geo-database like OSM is not.

If you plan to introduce such features, the OSM community should be involved in the process. You could write a description of the project on the forums and ask for opinions. 

This project might also be subject to our "organised editing" guidelines: https://wiki.openstreetmap.org/wiki/Organised_Editing/Activities

The import guidelines might be applicable as well:
https://wiki.openstreetmap.org/wiki/Import/Guidelines