Audio description isn't really painting mental pictures or anything. The describer can never speak over other people speaking during the show, so she doesn't have much time to give details. The point of audio description is just to describe actions that a blind listener might miss out on, because they aren't described as part of the show.
$1 is a pretty typical example. She's speaking quickly, and even so, she doesn't have time to do anything more than just say what's happened. Audio description rarely, if ever, describes what characters look like, or details about the sets, unless they're directly important to understanding the plot.