There's not really a tutorial, it comes with practice. You have to train yourself to break down complex shapes into simpler ones. Your simple shapes being just any basic geometric form like a sphere or cube. Simplifying isn't just a comic approach, its done by most everyone.
Female faces tend to be softer and rounder. Though that's just a guideline.
Pens are good in a way because you can't erase. They force you to see your mistakes. In order to not make mistakes you have to improve hand-eye coordination. So drawing with a pen can be beneficial.
I would draw with a pencil merely for the fact that you can draw very very lightly with a pencil. Start off with marks that you can barely see. Mark the locations of the major features and proportions. Then the major forms. Then refine and start getting darker and darker as you get what you want. But most of your drawing should be done lightly. The final marks will be the heaviest.
"Astronomy offers an aesthetic indulgence not duplicated in any other field. This is not an academic or hypothetical attraction and should require no apologies, for the beauty to be found in the skies has been universally appreciated for unrecorded centuries."