Without getting too in depth, I grabbed a picture off google images by an artist named Jenny Stout. It shows how to simplify the hands into a shape for the palm, then a line through the larger knuckles, then come in with some lines along the length of the fingers. Like the hand on the top right.
In general try to imagine the skeletal structure as you assemble the figure. Some how the spine feels disconnected as you get to the neck compared to the chest pelvis area.
Here a different artist Sean Taylor draws the spine in his initial gesture.