Hi David - welcome.
I believe you can have a separate post per book that you'd like to promote and have a few specifics for each including cover art. Always a good way to get your point across.
Then, with each as a separate thread per book it allows you to post updates - like new reviews you'd like to highlight, price changes and other promotions.
Having all your works in one thread might make your promotions a bit more painful to the reader.
EDIT: Also might be good to have links to your author page/website in your signature and in your profile so it's much easier for people to navigate to your work.
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