What impact do different images have on CTR or conversions?

Here's a frustrating truth about images in email: the "best" image type depends entirely on what you're asking the reader to do. But that doesn't mean there's nothing useful to say. Some patterns do hold up across tests, and knowing them helps you start from a smarter baseline.

Product images tend to win for direct-response emails where someone already has purchase intent. Clear, well-lit shots of the actual product reduce the mental friction between "I'm interested" and "I'm buying." If your CTA is "Shop now," this is usually your strongest visual choice.

Lifestyle images (product in context, aspirational settings) work better for brand-building and inspiration emails. They don't typically beat a clean product shot on a direct conversion email, but they outperform product images when you're nurturing someone earlier in the funnel.

Human faces are genuinely attention-grabbing. There's solid research showing people's eyes follow the gaze of a face in an image, so a person looking toward your CTA can draw attention to it. That said, a face in the wrong context can feel forced and actually reduces clicks (of course, easier said than done to know in advance which way it'll go for your audience).

User-generated content and real photos often outperform polished professional photography, especially for products with strong communities or social proof signals. A candid photo from a real customer, paired with a review snippet, can outperform a studio shot on conversion-focused emails.

No image at all is worth testing too. For plain-text-style emails, transactional messages, or anything where urgency matters, stripping out the image removes distraction and can lift CTR. Don't assume more visual always means more clicks.

The honest answer is that none of this replaces actually testing your images against your own audience. What converts for a fashion brand with a young audience may do nothing for a B2B SaaS email. Your list, your goal, and your CTA all shape what image earns the click.

Now a few things that genuinely move the needle when testing image types:

• Test one variable at a time. Image type vs. image type, not image type vs. subject line at the same time.
• Give your test enough volume to be meaningful. A 50-person list won't tell you anything statistically useful.
• Track the right metric. CTR and conversion rate are not the same thing. An image can drive clicks and still kill purchases if it sets wrong expectations.
• Don't forget ALT text. A significant share of subscribers see emails with images turned off. If your image has no ALT text, that audience sees a blank box, and that affects your results too.

If you're just getting started with image testing, pick the clearest hypothesis first. "Does showing a face on this CTA section increase clicks versus showing the product alone?" Run it, measure it, move on to the next one. That beats reading about what works for someone else's list every time.