
Now the clouds. I like a 4000 to 5000 ft thick layer of Cirrus at around 40,000 ft. I usually set it to "overcast". That gives me this..

Then I have a layer of Status about 4000 ft thick below that at about 4/8 coverage. Gives you this.

Then for a dramatic look, just add some broken Cumulus below that.

That is all I do. No big secret to it.