The tutorial is excellent. Very well explained, very well exemplified.
The skies are, without a doubt, one of the pictorial elements that seduce me the most: I love the skies of expressionism and the skies of romanticism. I love cotton clouds over intensely blue skies and fiery sunsets.
I think your work will be very useful to achieve a few longings.
Thank you very much, @quantum. You have an efficient, beautiful and generous way of teaching.
A huge hug.