There are heaps of videos on Youtube showing art techniques. Some are more helpful than others, but I watch them in the hopes of picking up some ideas. This one by Susan Avis Murphy made me want to try a variation on her technique at my regular Friday night figure session. https://www.youtube.com/watch?v=Y4rWb6IUB3c
Starting with a prepared paper (easy-lifting pigments on Fabriano soft press paper) as the middle value, I can scrub out highlights and paint in shadows – the method of working is more like oil painting. Here are a few examples of the results.