Hmm... The challenge is that The Moon Etherium is a fantasy novel with a strong romance plot line. If I looked at the painted cover with the tagline and didn't know anything about the book, I would have guessed it was a romance about two lovers throwing everything to the wind for feelings, which it's totally not, and skipped a novel I would have thoroughly enjoyed.
On the other hand, the poses on the the silhouette cover make it read weakly as a romance cover and not as a fantasy cover at all. I think Miro's pose could be adjusted to make the silhouette cover read as a fantasy cover, but it depends on how you're planning on marketing the book.
If you're planning on targeting romance readers, I'd scrap the tagline for one that better fits the romantic plot line. If you're hoping to pull in fantasy readers who like romance in their fantasy novels, I think that neither of the covers are currently suitable.