It is pretty easy actually, I guess you just need to get the hang of it. I mostly use airbrush for my clouds, soo no fancy brushes needed (though I do use some on my newer drawings just to make it faster).
Not necessarily. it is true that digital art has a few benefits, like changing the brush to any size, but it's not easier to do as traditional art. You have to spend years learning and practicing to master it, just like traditional art (and when you're good at one, you can take that knowledge into the other one). Sorry, but I can't stand it if someone says that traditionall drawing is so much harder to to than digital I always had to defend myself in school, because I was the only one doing art assignments digital and always had to prove I didn't just copy stuff from google. Maybe you could get inspiration from s stuff. he only works traditional, but I guess his cloud technique is similair to mine.