I love the color on these, the facial expression on the second one is great too. Try adding a hint of color to your regular sketches, it can add another layer to a quick gesture.
Humm will do.
I like the first one you did in watercolor. It looks really good and the proportions are really nice. The second one has a really good sense of weight too! Great expressions!
I like the form of the first sketch, seems to hold well to structure and anatomy, but the second one with Don has a really good sense weight and movement.