Using humans in your Amazon images harms conversion.
Use them only when strictly necessary and when they truly help communicate your message.
I've now run hundreds of listing simulation surveys in Sellametrics and see this pattern repeatedly.
Where there are lifestyle images with humans enjoying the "transformation," usually, the image scores the worst.
Don't distract; focus on your product benefits instead.
And when we replace those images with proper infographics - sales go up 99% of the time.
A category where you need to use human models is anything garments, tools, accessories.
And there, oftentimes, showing the model's eyes can be a distraction, for example, lingerie.
Have a vacuum cleaner? You can show a person using it.
Hand tools? Show them in hands, cropped.
Supplements and humans... so-so.