I am in love with the dress pictured on this romance book. Thankfully there was a text-free version on the interwebs, so I could see it without a great big "Sabrina Jeffries" and a book title getting in the way. The colour is a bit different between the two images, particularly the sheen of the dress and the landscape behind the couple.
One of my favourite series also has some of my favourite cover art: The Parasol Protectorate. This steampunk/paranormal/alternate Victorian era comedy of manners extravaganza has covers built around gorgeous photos of a model who closely resembles the heroine. The images are then photoshopped them to include other design elements. Holy cow, is that a technical and tedious process. I bow to graphic designers. Check out the video of the making of the Blameless cover:
These covers are the reason I purchased the paperback editions, not the ebooks. The colour of Alexia's dresses, and the titles, really pop against the misty gray skies, the masonry, and the pyramids.