I'm not sure I follow. Seeing your initial post with the cover page, at a thumbnail size, no one will be able to read the title. It's ok to overlay the title over the bottom part of the art (perhaps with a bold stroke around the edges in a different color for better visibility) so that the title fits the entire width of the Page.
It's harder to read when words are written vertically cause English is left to right.
Essentially you want a reader to, at a glance, see your story's Title and a glimpse into its tone by the cover art.