Both are great work. Well done.
Since you asked for a preference, I'll say that the more realistic one (1) is my fav.
In the more realistic one, their faces convey a sense of deeper intimacy and love for one another.
One suggestion (not a criticism):
Since Mara is written to be an EE-cupper, her breasts would be at least twice the size of the current pic.
Even though the pics show her as having a slim figure (and thus smaller band size/bigger cup size) she seems to be more of a 36-C/D.
An EE-cup would be the equivalent of a DDD.
Again, it's not a criticism. The pics are fantastic. In fact, although I generally believe that a D-cup is a starter kit, Mara's figure is very feminine and lovely. Very symmetrical for the picture and in alignment with Jamie. So while I usually believe bigger is better, it might not be for this particular cover photo.
Thanks for sharing. Truly great work. Cheers