Short tutorial: shadows of layers (Patreon)

I have made a short tutorial for someone who asked me about, how I draw shadow layers to give them more depth. To be still detailed, here is short explanation:

1) zero: no shadows

2) lowest layer: gradient shadows in the corners, because all things sunk in twilight seem to be deeper.

3) middle layer: shadows made by the sunlight.

4) highest layer: supporting shadows from middle layer by adding them more depth.

All layers are 100% transparency, multiply, colored in pink-purple.