#1 doesn't matter that the jacket is gone. It's white, who cares.
#2 is definitely cool, more interesting of a pose than #1.
#3 were you facing the sun? Because it is hitting you guys hard especially if it flares up the left side of her like that, and still manages to be slightly under-exposed (JUST SLIGHTLY!)
#4 is pretty spot on.
What was the point of these shots? Is this a client, or just a fun session with a hot friend. . .0_0
Oh and rule of thumb, always better to under than overexpose. Sounds cliched but has saved my bacon more than once.