Simple, yet very effective ideas for drawing the hands. Recommend this course for all levels as it covers how to draw hands from the very beginning and ends with some excellent advice for adding details.
The image below is my Structure demo which is basically a series of timed poses. I had to complete each hand within the allotted 4 minutes.
This image is a lecture about hand transitions, tips for adding perspective and understand the effects of gesture in the joints and thumb.