Landscape 23-second warm-up

Done as part of a practice session with poses of 23 seconds in length. My current goal is: Make my one-point perspectives more fastest and good-er. Greetings everyone, this is Polyvios Animations here, and this is my very first landscape 23 second warm-up sketch. It's of an angle from a doorway at a sports stadium. I've already mastered it, I think. What do you think?