First name the image properly. Although this doesn’t help
with optimization of your site, use relevant keywords.
Give the image an ALT tag.
This is what Google uses to index the image and the overall webpage.
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5. TAKE NOTE...
Google also takes into account image size.
Keep images as small as you can without losing visual impact.
The speed a page loads is important, especially on mobile devices.
Image uniqueness is important.
Make images shareable on Social (Pinterest + Facebook).