My 11 year old daughter is 5'5". Her height is always the topic of dicussion at gatherings.
Taken at Cathedral Lake, Yosemite. That's Cathedral Peak behind her.
It was cold as heck, got down in the low 20's that night.
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The low viewpoint is a good idea and conveys the message of "tallness". But I think it is a bit overdone. Shooting with the camera a bit higher and further back (but zoomed in to keep her the same size) would still portray her as tall, but the exaggeration would be more subtle and the overall photo more attractive.
Why would you desaturate the color of your subject and leave everything else in color? In this particular case, it doesn't really keep the viewer from focusin on the subject, but the question still remains. I can't determine how this choice helps the overall impact of the photograph.