Most PDPs bury them at the bottom, after specs and shipping info. But shoppers look for proof the moment they hesitate, usually next to the price and the Add to Cart button.
Your hero image has about one second to win the click.
On a collection page or search grid, shoppers aren't reading. They're scanning thumbnails. Here's the anatomy I use to design a hero that wins that tiny square:
One product, one angle. Clutter disappears at 200px.