scelestic
1&2 First of all look the same. The lighting is a bit too harsh though. Its blowing out some of their faces. 3 is your best.
Ya. Big tip (I'm late but I thought I could quickly add a comment before I head off) don't have people face the sun. Turn them around if you can and have the sun backlight them.
Or you can do what I do, if the backgrounds nice and they like where they are but they're still facing the sun.. Find something to go in between the sun and them. I used to get either several large pieces of foam core (Which I did at first, not that great) or some translucent material and put them on these home made stands I made (Made out of wood - WOO! Go lowes!) and several C Clamps to hold them and it'd just soften the light from the sun enough to make a rather pleasing portrait.
But anywho, now I'm really late. haha! Gotta run!