I'm assuming "CanStock" won't appear on the actual covers
The colours of the image on the right feels more dramatic, if that suits the story. I can't make out what those black squiggles are in the centre, and I feel as though it may be a be too empty in the centre with your proposed layout.
I like the image on the left when it's shown larger, I think it works better with the layout, but I think it may be a bit busy to work when small - the branches in the centre don't stand all that well in the thumbnail.
Neither of them give me the impression of a romance.
Merry Christmas!