Start off with this "dorsal fin" shape
Draw the outline for the thumb, index finger, and side of the hand
Ring finger, pinkie finger. Side of hand and part of arm.
Now turn your paper
You can stop here, or read on and add more
Draw how long you want your nails to be
Decorate the nails how you want! Not needed, but a nice touch
Add any tattoos, bracelets, background, or other designs here!
Here I added a henna my friend saw online, and a wraparound ring.
Add realistic effects! Shadowing, birthmarks, things like that
See? I added shadows and a few small marks on the skin.