Bigger would definitely be better... when they're that small its hard to give accurate C&C!!! (And I probably shouldn't be giving C&C anyway, because I'M not a pro -just learning- )
but here's my take on these pictures (from what I can gather from such small images)
#1 is not composed ideally. There is too much dead space above her head, and the picture would have improved greatly with all of her arms showing, not cut off that way. Also would be nice to see what she's holding onto better. People don't stand in that hunched shoulder position without something to lean on, and when we can't see it, it just makes the picture look awkward.
I like #2 much better, though from what I can see, her face could use more light on the right side, where her eye is in shadow. A reflector maybe? But I like the pose, and whatever it is she's on top of! Pretty model.