Great shot. Wonderful subjects (no artifice in evidence) stand out against muted but defined background. Also fits my Platonic Idea of what a photo is. (Not sure about the frame: I'd opt for something more classic like white or black; the grey seems to merge with tree trunk on the right). (Disagree that it needs more contrast; the contrast is there where it belongs, in the subjects). At least an 8.
This is going on my favorites. A definite 10. Beautiful shot with two beautiful models. The expressions on their faces are priceless. Great job on this one!