Now I need a banner image for my homepage hero section.

I'm going to use Shopify's free image library, so give me:

1. A 2-3 word search term I should type in Shopify's image search to find the perfect banner image
2. What to look for in the image (composition, mood, elements)
3. Why this type of image will work for my target audience

Keep the search term simple and specific so I can easily find relevant images.