The edges need to be tidied up - I know you have straightened it but crop it down to remove the white corners - then...
I would crop it to accentuate key points - most of the modelling snaps I have seen are using infinity angles - i.e cropped in really tightly so slight bit off the tops of the heads are missing. You could also accentuate the bag and the hands on hips in the same way. I would bring up a slight bit on the saturation and contrast make it just that little bit edgy.
other than that - good snap!