Since the banner captures the major portion of your website, it is essential to experiment with various versions of hero images to identify which one is driving your conversion rate objectives. It could be reading a blog or clicking a CTA to interact on your site. By showcasing different versions to your visitors, you can utilize the data to figure out which version of you page converts better.
If a challenger page fails to beat actual page, you can always experiment new hypothesis, with changes in CTA and hero image.
Your takeaway- keep it attractive, keep it simple and keep testing it.
By continuously testing different images you can improve your conversion rates and website experience over time.