Hope it's helpful! These are just the observations that helped me the most, and the ones that seem to get overlooked.
This stuff should work in any style. :3
More information can be found in the drawings (and in the drawings linked to below) than in the writing alone. For example, look at how the fingernail affects the angle of the tip of the finger when viewed from the side. (See, it'd just be confusing to write about that kind of thing. orz;; )
EDIT: That's how high MY thumb reaches when lying flat. Since I made this, it's come to my attention that my thumb is abnormally short! If I had been aware of this, I would have averaged the length for this tutorial. This is why it's important to combine tutorial learning with personal observation! Everyone observes things in slightly different ways no matter what, partly because natural organisms vary widely in shape and proportion.