The last is my favourite. The glow in her eyes is ever so pretty, and the time of the day gives all these photos such a lovely warm glow. They glow from within and the sun adds to it ... you are right, their being in love cannot be overlooked.
The first has some compositional flaws, so I feel I can't make that one my favourite. I could possibly still overlook the fact that they have a lot of sky above their heads but no feet, neither of the two, but the fact that you "severed" her right hand by your frame ... now that niggles me somewhat.