Since this album is not identified, Roon is unable to provide an image. However, if you have an image in your files that should import. Do you have an image file? Can you share a screenshot of this in the storage location via File Explorer / Finder if so?
I fixed all albums without artwork. I went to the album page, then clicked on the 3 dots. Then I chose edit. Then identify album and presto, I have my artwork!