A question about the SEO of the images

Hello, I have a question about the correct Seo for my images.

When I upload an image, I optimize it by filling in the fields that appear as a title, alternative text, description, legend and that.

In addition, the option in the Yoast module of redirecting the urls of the attachments to the corresponding entry has been checked.

My question is, I must optimize the fields in the attachment view or it is enough with the basic fields when I upload an image.

Keep in mind that my readers never see the page of attachments and have no access to it, but I do not know if google yes. Help me please.

The page I need help with: [log in to see the link]