What are some of the identifiable elements of "The Tragedy", by Pablo Picasso?

This painting, first of all, is from Pablo Picasso's Blue
Period, a time when he embraced symbolist color, a technique that moves sharply away
from realism.  For, the painter's overriding aim is to express his feelings about the
theme of the painting.  Thus color becomes a powerful symbol of emotions, thoughts, and
moods.   

Picasso's painting, The
Tragedy, underscores his statement, "Art is the elimination of the
unnecessary." For, by using one color and only a minimal amount of hues, the melancholic
emotion of the painting in blue is readily communicated to the viewer.  With this sense
of melancholy and despair, the composition of the painting points also to the despair of
the man and woman who are without shoes on a forlorn beach away from society, in
dejected postures.  The boy's hands are out as though he speaks to the parents in an
effort to move them from their obvious dejection, but their heads are down in an act of
refusal to see only their thoughts. That the reason for the tragedy is not apparent is
not necessary to this painting which conveys a singleness of emotion and
mood. 

This singleness of emotion may be all that Picasso
wished to express in his personal depression over the suicide of a friend, Carlos
Casagenamas.