I would recommend posting in one thread of you are going to post the same thing in both threads, and try and limit yourself to your best shots. I know it's hard, I've been struggling with the same thing but you have to also be your own critic.
First of all, each and everyone of your "snapshots" are completely out of focus.
Secondly, I know you were trying to capture "natural" facial expression but these simply don't do it for me and lack in composition.
The reason, imo, for the different colour skin tone would be from the inconsistency in exposure and WB (white balance) levels.
What settings where you using on your camera?