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Do you see any differences that are related to the SafeSearch filter setting - that is, if you set the filter to "off" does, your page count come back to what you expect?
I am not sure what you mean by universal search result.
What I do is type the name of our product and then click on Images at the top of the Google / Firefox screen.
Our product images comes up from other websites that mention or stock it, but not our own website, which is well represented in normal Google searches.
Also in the other sites where our product is mentioned quite often an image of our product does not come up, but you get other pics from the site - not of our product.
Try a search such as site:example.com product, where your domain is example.com. That will show you if the images from your site are indexed - at least to a degree, keywords being a bit "fuzzy" in image search.