DD #10: Focus on Hands 01

Yes, right, today I haven chosen the supreme drawing discipline: hands. They are tricky, they are transforming, they are just brilliant. I found a sketch from 2001 (!) drawing my dad's hands on some ski vacation, it's the last one below. I wonder if I made any progress from then to now :P
To do it right, I picked my old Loomis 'Head & Hands' Edition to try and copy the depicted hand construction ways (from p120). There's still a lot of work to do.