How to improve on hands?

So I’ve been working on hands for a while, and I looked at some other artists, and I want to know how do you make hands?

Looking at flycat and some other artists, they have 6 sided fingers, how do they make knuckles? The finger designs I usually use are 8 sided, and the extra geometry helps form the knuckles, but they raise the polycount of the arms.

Another issue is the humps on the palm of the hand where the thumb muscle and under the pinky are, how would you make them while maintaining low polycount and clean topology?