Do your best to draw this entire scene using a pencil on any paper you have.
Do not worry about color (the scene is almost colorless anyway).
Include the trees on the left he adds around 22:00 minutes in. Don’t give up!
Some effects are challenging because it is a painting— that’s okay, just try then move on.
Include as much as you can of his use of SPACE: How does he get that forest so “far” back there?