Recent page has been added to the Life drawing category of two beautiful portraits. I will add one picture featured below sketched in the un-reveling nude figure fashion since this is pictured on a post page. Drawn on Strathmore artist cream color paper with basic charcoal in a 15 minute pose by a professional model. Without a photograph to view the expression was captured beautifully. The hand needs some improvement as far as detail to shape and shadows, but overall the sketch came out well. I find myself wanting to add more realistic detail at the fifteen minute duration poses. At this point I can render a fairly nice sketch, after this point I would need to use charcoal pencils to get tighter detail for more control of the medium. I also would use a different hot pressed surface paper for a longer posed sketch, a smoother surface would give me and allow more control with realistic detail.
If you double-click on the picture you can see the surface of cold press paper and how the charcoal goes on that surface. The paper was bought on clearance and I usually do not use cold press for life drawing, if I were in a pinch and wanted to work this drawing longer into a realistic sketch {sometimes a model will pose several minutes longer or come back to a difficult pose later} spray workable fixatif would follow next and then charcoal pencils which would allow a slight more amount of detail without taking up what was already down. 
Roxanne 