I was looking up on different lunar observing styles and came across this technique (LINK) that intrigues me. I still need to get into lunar sketching, and may give this an attempt as we enter into the moon phases if the weather allows it. It is by Daniel Mounsey and was a CloudyNights Review from 2004. It is downloadable so you can save it if you would like to. Please feel free to leave any link to your own site for how you sketch the moon in the comments and I'll approve them so they show here. I'd be excited to see that. There is also a new sketching book on sketching the moon that is coming out by some of the best lunar sketchers in the hobby. It is called Sketching the Moon: An Astronomical Artists Guide and here is the Amazon link.