Sorry to contradict you but IMO the meta keywords tag is dead nowadays and has no purpose.
Google openly admited that they dropped this from their search ranking criteria as far back as 2009, and Bing dropped it in 2014.
The way to get your site noticed in search results has long been to write engaing, meaningful content. However, we have a problem with an image hosting website as it has no written content (well very little) !
One of my Chevy websites sits at number one in Google search for it's niche. All I've done is write an accurate descriptions in various parts of the dashboard.
dashboard --> settings --> Website
Complete first 3 fields (Website name/doctitle/description)
and
dashboard --> settings --> Homepage
"Title" and "Paragraph" fields
Google most certainly uses keywords, it just doesn't get them from a meta keywords tag anymore.