Hi John,
There are some aspects of this photo I really like but I especially like groups of three. 3 is sort of a magic number for me. 3 means the possibility of depth as in 3d. 3 can also add a dynamic human quality, too. The large planes of the wall are good compositional but make the photo a challenge to print, too.
All my opinion below, take it with a grain of salt. ;-)
Challenge 1- The middle wall and the right wall have tonality to close to the clothing, therefore the photo lacks tonal depth.
Challenge 2- Is really also an opportunity, that is the backlight. Asher is right about burning in the sky. Too white, no tone, it draws the eye out of the subject area.
My quick solution to above.
I did the following.
1- Darkened the top slightly of the middle person, lightened the top of the girl on the right to draw away from the walls. I tried to play with the tonality of the large middle wall but because it has little texture it didn't take well to any manipulation. did both with levels and tweaked with dodge and burn tool
2- dodged the top of the umbrella and along the roof line of the middle wall to heighten the back light effect. Also dodged along the top left edge of the right wall to give the effect of light spilling over.
3- burned in the roof shingles and around them to corner off the picture a bit.
4- Drew levels down in sky to 240 about
4- Cropped left edge of photo to my taste.
The picture has wonderful contrast and is a great moment in the lives of these kids. The extended arm, the cross on the tee shirt add real interest. The stump on the right with the slanting light places me there.
I would be curious to see the color version because different variations of the conversion from color might make a huge difference in BW tonal rendering. Do you like Ektar 25 for BW conversions? Is it still available?