i like 1. i wouldnt change anything. this will look great printed. 2 looks very commercially, like she is in a ring ad or something. 3 and 4 i would scrap. 3 looks ackward and 4 is just not a good pose.
love 1! i feel their happiness. i think it is a great capture especially considering the varying skin tones. i think you got a good blend here.
i would recommend adding a nice 50mm f1.4 or a 85mm f1.4 to your bag of tricks. they are great for portraits.