Grab a bit of paper and a pencil,
draw your own hand drawing…
start off by doing the simple lines then try this…
scribble the lines of the curves of the skin, no outlines follow the contours
then try it again but keep it so the scribbles are really dense and you’ll really feel the shape of the hand, you pencil should be hardly leaving the paper, every single stroke should follow a contour of the hand.
Now try drawing the other hand, but keep looking at the other hand, try not to look at your paper,
give it a go, really improves the way you draw humans and also keeps you looking at your subject whilst you draw it which really improves technique.
Dave