Tracing with your eyes
I learned to draw hands and other things by practicing something we elves call Tracing With Your Eyes.
Put the hand that you don’t draw with in this position (above). Then, choose a starting point anywhere on your hand: put your pencil on your paper and start to draw your own hand.
As your eyes move along the outside of your hand, move your pencil the same amount. Imagine your eyes and pencil are the same thing, moving at the same speed. Follow only the edges, or contours, of your hand, and only look at the paper to start a new line.
Here is what I drew when I traced with my eyes.
You can see that it might not be the prettiest hand, but I am improving how I see. The more you practice seeing, the better your drawings will be.
By the way, this how my drawing turned out when I didn’t look at my paper at all. Weird! But this is actually good practice, too.