Hello DTG
I am not a protrait type, so this is only my thoughts...
There is too much backround to the shots, distracting from the star(s).
#2
the sun is too much on top of their heads, instead of behind the heads.
#3
The b&w is very nice, maybe try for more bokeh and you have a winner.
#4
Same as 3, more bokeh and there is great feelings in this shot.
I like the fact you moved them each from one side to the other.
I also noticed that you stand to the right side for all of these shots...