I have downloaded a high-quality picture of that drawing from Pinterest. It's not the original one, but it's completely the same.
Liz Toomes had sketched the battle of New York on a paper.
The drawing important features:
- Captain America's black star; which was on his suit in Avengers: Infinity War.
- Iron Man's pentagon-shaped arc reactor; which was present on his suit in Captain America: Civil War.
- Hawkeye's sword; which he was yielding in Avengers: Endgame.
- The Hulk's red eyes; which he got them in Avengers: Age of Ultron.
Were these just intentionally implemented into the movie for making references to other Marvel movies, or it was an important thing?