Actually, I got a different impression from the poster. Their expressions were those of determination, not happiness or bliss. The fact that they were holding hands showed that there was an iron bond between them - but not necessarily a bond of love. I actually found the juxtaposition of the hand-holding (which usually indicates romance) with the faces that showed no romance to be a very interesting combination.
It suggested that romance could possibly develop, but the most important thing was that these two people would take on the challenges ahead together.
