Potraiture : capturing emotions

Other than macro or close ups, potraits is the other field I'd like to master, (or at least dream about it). I'm always fascinated by the ability of great photographers out there who not only are able to capture the moment, but the also the emotions behind the scene.
Unfortunately, my unstable hands are not quite cooperative partners of mine. Sometimes I guess I was just thinking to much, what setting should I choose... am I using the right lense..etc..etc.. and before I knew it the moment just passes by, especially when the subjects are children. Here are a couple that all I can say are lucky shots.