Start by drawing a square which will serve as a rough outline of your fist.
Now draw the palm.
Draw the shape of the fingers, excluding the thumb.
The thumb, which has its own unique shape, is positioned over top of the other fingers.
Draw the base of the thumb in the center of the palm.
Now draw the fingers. Each finger should be smaller than the last.
Here, we can only see one phalanx on each finger, except for the ring and pinky fingers where we can see a bit of the second phalanx.
Now, we're going to add the finishing touches.
Do the outline.
Draw the joint that connects to the base of the index finger.
Now draw the creases in the joints of the ring finger and pinky.