First i like the photo, i like the composition and the sepia toning.
What's to improve?
- exposure: watch out the sunlit parts of the statue, they are close to be blown out or they are blown out. This results that you have lost any structure in there... its now just a big white patch. Since the light parts of the statue are dominant you should expose for them.
- focus/DOF: a bit two shallow, the girls face is in focus the boy's one is out. use a smaller aperture.
- develop: i would increase the contrast in the final photo.