Put the safest Open Graph image first
Many crawlers use the first valid Open Graph image they find. Keep the first image wide, direct, public and close to 1200x630.
A 1.91:1 image is the safest default for Facebook, LinkedIn, Slack, Telegram and most unfurl cards. X large cards also work well with 1200x628 or a close ratio.
Avoid putting a logo, tiny thumbnail or portrait image before the main sharing image. Keep redirects, bot challenges and oversized files away from the primary image URL.
Add width, height, type and alt metadata next to the image. That gives crawlers enough context before they fetch the asset.