My product-pushing site now gets 40% of its traffic from Google image search and only 35% from Google web search. I don't have break-downs on what percentage of each then click through to Amazon or other affiliates, but for that site, it's 95% of all visitors anyways.
Have good image names and alt text. Place them high enough on the page that they're at least partially visible. Otherwise people won't even look at your page, but will just click on the image in the top frame.
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