Do not ignore the unexpected or the unusual.  Just because it is not on the photographic agenda, does not mean to pass over it.  Indeed this may make it the better photo.  An unusual pose is as good as unusual content.  Set the finger-pushing alarm to go off for the unusual.

See more of the unusual in Fill the Frame, Humor, Painted Faces, and Partial Subject.

See also how expert photgraphers portray Portraits in Odd Positions.
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Boy Scout Troop 174, Yorktown, NY.  Scouting Photography Pages at  http://troop174.info