Write a Little -- Description

What happens when you get writer's block.? You can't think of anything to write. You are too busy to form a thought into a cohesive sentence. That is where I am at today as I try to come up with a writing prompt. I want to hone my people description skills this week. This week observe a complete stranger and then write a description.

For example: The slender man's disjointed shoulders curved forward, his midsection slightly bowed like the letter "C" and his puppet like arms swung loosely by his side. His brisk apish walk down the night shrouded sidewalk made me question if there is some hidden secret in that walk, some hidden darkness. Can a person's silhouette mark his character?