For the benefit of the commenters (whose comments are very much appreciated!) I'll paste the assignment as it was written so the the goal is not so mysterious.
Is he following someone? Is he lost? Does he see the manhole in front of him? Is someone following him? The same character could walk different in each of those situations.
So... put some "thought" into your poses. Don't worry about over-acting now, the more obvious, the better... make it about the body, not the face.