Basic Hand Structure - Modeling or Rigging, these drawing tips should help you keep in mind important details of the hands.
Hand Drawing Reference Guide (Tips) | Drawing References and Resources | Scoop.it
Another version here with the floor plan: built4ever.deviantart.com/art/…
Hands - Sometimes they can be really difficult to get right. When in doubt, take a photo of your own hand/s with your phone & use that as a reference too.
Just in case; make that, when I find time to learn to draw :-/)
Hands. Tips on drawing hands.
ANALYTICAL FIGURE DRAWING