On which scale do you sketch (a almost full) moon?
Is it more easy to sketch a single feature (crater,...) than the whole moon?
Thanks for your kind advise.
Welcome to the world of astronomy sketch art! You have made some great first sketches and I commend you
The questions about how to proceed with format size and amount of image to work with on the moon were answered well by all the others.
I could not add much more other than my own personal feelings about sketching. I too started in smaller formats with the moon a couple years ago. The general artistic process will temp you to work larger one day (or night.)
I then began to remember my college art teacher telling us to work as large as possible. This will always intimidate the new artist as you decide to eventually make a great work of art, you will eventually owe it to yourself to experience working on the larger pastel papers available from many art supply stores. These are the 19" X 25" and up to 22" X 30" (inches) or 64.5 X 50 cm in black cotton fiber papers such as most of my lunar sketches are produced on now. (I render the full moon in a 15 ~ 16 inch or 35 cm diameter.) You could just as easily spend much time on a detailed close-up of a single crater as compared to rendering the entire moon in detail. It becomes a personal choice and process. You could call it artistic license and freedom of the artist.
Also see the tutorial sites here and the Astronomy Sketch Book authored by several in the Cloudy Nights site.
Good luck and I look forward to seeing your future sketch work,
My CN Gallery