[subterfuge]

i'm not guitar, but maybe i can help. Just always use references, and draw the hand's outline, then exaggerate the pose, for comic book work. Use google for photo references, and copy the hands you see in existing comic books, because they're always grasping a staff or a sword and they're always slightly larger than they would be in real life, so the details are easy to see. Don't ever just avoid drawing hands or feet though. Practice all the time and you'll see improvement.