Dave and Jef,
Thank you both for your kind words.
I began astronomical sketches just for myself in my observing logs long ago using a number 2 graphite pencil, sometimes even a ball point pen. I didn't get serious about Astronomical sketching until I joined Cloudy Nights and met up with Rich Handy (KraterKid). He and Erika Rix and a few others inspired me to move on in sketching and I read and used many of the tutorials at the top of the Sketching Forum when I got stuck. Also they are both co-authors of the book: "Astronomical Sketching: A Step by Step Introduction"by R. Handy, D. Moody, J. Perez, E. Rix and S. Robbins. This is an excellent work for teaching astronomical sketching in various medias and of all types of astronomical targets. I highly recommend you get a copy and read and use it carefully.
The telescope I like to sketch with most frequently is a 10" f/5.7 Dobsonian. I sometimes use a 13.1" f/6, 4.25" f/5 and an 18" f/5 but currently I don't have a working equatorial platform for the 18".
Usually I sketch standing at the eyepiece using a clipboard.
For lunar sketching I use much light because it really does not intefere in any way but only makes it easier. I prefer to sketch with black paper and white pastel pencils and Conte'crayons because they erase easily and I can control the brightness with just a change in pressure. For areas that are in dark shadow you can erase or also add black pastel pencil which I do most often. Fingertips work well for blending in the bright background and I have a pretty good eye for shapes and judging sizes. After lightly sketching in the shadows and light areas in outline it is just a matter of going after the detail. I have yet to include all the detail I can see at the eyepiece in a sketch. I try not to sketch more than I know I can do in a reasonable amount of time. I made 50+ lunar sketches from photographs before I ever did a lunar sketch at the eyepiece in white on black. After using graphite on white paper it was like starting over from scratch. I struggled for weeks before I started to get it. A person with artistic talent could probable do well on the first try. Some of the folks sketching here fall in that category.
I have never been able to sketch all the detail I can see at the eyepiece-- I try to keep the sketches to about 1.5 hours or less. I can't do more than two sketches in an evening because sketching drains all my energy.