Creating Tags for SEO in "Work" Formats

Site URL: https://www.michellereneebernard.com/gallery-paintings

I just switched my paintings gallery from a "Gallery" page fed by a "Portfolio" I set up... to a "Work" page that allows clickthroughs to individual pages for each of my paintings. I had wanted to add the extra information about size, pricing, and more detailed descriptions that the Gallery/Portfolio setup did not allow for.

However, I don't see anywhere in this new Work setup where I can add tags for each of the individual images on their independent pages. In the Gallery setup, the Portfolio that it populates pictures from had an option for each image where I could add tags. 

So I'm wondering if there's any way to add tags to my individual page images in the new Work setup? And if not, well... that's disappointing, but... then is there a way to add more lines in the Gallery/Portfolio setup? I believe anything I typed in (even if I hit the return button), would only show up as one long sentence.

OLD WAY: Gallery/Portfolio: https://www.michellereneebernard.com/gallery-original-paintings

NEW WAY: Work + Individual Pages: https://www.michellereneebernard.com/gallery-paintings

Please keep in mind I'm a total tech dummy when answering. 

Thanks so much!

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