I have a bit of constructive feedback on anatomy. Mal's jawline is one clean curve, which makes the face look really odd. A jaw hasa part that makes a much sharper angle, and it is really bugging me. I noticed a little bit of this with Inara, but the hair really hides it and it looks fine.
Other than that, I love both the emotion and the way you colored them. The coloring has an almost watercolor feel to it, which really captures the soft mood.