Based on analysis of the stereo imagery, the best explanation is that the feature was indeed sculpted - not by a Martian hand, but by the Martian wind.
Some folks make a habit of looking for strange features in the pictures that have come from the Mars rovers over the past four years - features like "bunny ears" (bits of fabric left behind by the rovers), or the "Martian footprint" (the imprint of a wheel tread), or "rover rotini" (a mysterious curlicue that might be a mark left behind by a drill).

Now, in the stereo image below, our man is shown as a dark speck in the upper left portion of the photo. We can see rocks of many shapes in the same color around our (imaginary) man.

