@Alan Minor - Character Hand Modelling Progress Issues

I have been modelling my alien's fingers and hand. While I am still in the process of attaching and sculpting the thumb, along with needing to add more geometry to the hand still, I am concerned about the fingers. I tried to make his fingers look more alien-like and slim, but in the finger joint areas I am getting strange creases appearing from some angles. I wanted to make the finger knuckles look more prominent and less tubular as a whole, but whenever I arrange the geometry to get rid of the creases in the side of the finger joints, the finger loses the shape and prominence of the joints. I am unsure about where I may need to add geometry in the fingers to solve this issue, especially as the character has long fingers. I am also slightly concerned about whether the hand will be able to form a convincing fist during the later stages, due to the size of the fingers.