I've been studying composition lately, so this edit is mostly practice at cropping.
Cropping: Boy is the main subject, most of the woman cropped out to lessen her importance, which gives the picture more of a feel of looking over her shoulder at what she's focused on. Angle was selected to give the picture more flow, and place the pigeon kiss on one hotspot, the camera in foreground on the other. Woman's camera arm forms another nice diagonal that seems to add to the flow.
After cropping:
- duplicate layer, mask out main subjects. Play with Gaussian blur to find an amount that doesn't look too artificial, and doesn't blur out the architectural lines in the background.
- add curves layer. click auto to fix per-channel ranges, then use midtone eyedropper to fix whitebalance off a gray spot on woman's shirt. Also brightened the main curve a little.
- add hue/saturation layer, saturation +15 seems to give it enough color without looking artificial (to my eye, anyway)