Winter time is slow time - NOT! Still chugging away making copper boats as of late but in the interim on some evenings I've been sketching live models. Start out with one minute time limits and then work up to 5-10-15 and maybe 20min max. The one minute sessions are not easy but you do get a lot out of it later. 15min is the perfect time for me since I've been doing 15 min sketches for years. I'm finding I have time to get the person drawn in and then shading too, cuz once the time is up the model moves and is gone forever. Capture what you see now!