When I was in school, our Hindi syllabus featured a poem by Harivanshrai Bachchan. I don't recall all of it, but its endearing content left a lasting impression on moi.
The first few lines went something like:
Ma, kya mujhko udna aaya?
Nahi churangan tu bharmaya.
(Loosely translated as: Mother, am I ready to fly?
No, little one, you are mistaken.)
The poem was about a young bird anxious to soar into the vast expanse of the never-ending sky.
When I look at this picture, it brings to mind an individual's constant anticipation of things to happen/fall in place. While his friend there, happily flaps its wings, this one quietly awaits its turn.
Note: This is not a black and white photograph. The day just happened to be dark, dull and grey.