For the palm of the hand, first draw a trapezoid and a thin curve on the top. Then, draw a wide triangle on the side of the trapezoid.

The joints of the fingers do not line up in a straight line; draw a curve for the first set of joints, then a skewed curve for the tips of the fingers

When drawing the fingers, the tips of the fingers are round and sometimes squarish, not pointy.

Make sure to keep the fingers going in one direction radially so that they don't look broken

For the final line art, add slight bumps where the joints would be. Then add other details, such as nails or tendons