I Call This a 3D Character
I would suggest having the thumb going over the index to the ring finger because I do not think that it is possible to clutch your hand like this in real life.
Edit: Fixed a spelling mistake
I learned this type of finger from minecraft rigs , but i will try to make it more like real life
Nice job! I love your idea of fingers! Add some animation to the rig and show me I want to see it