Lastly, you should try to draw a detailed close-up of your characters face, as it can tend to get minimized and a little sloppy in full-body shots. (You should draw close-ups of any other important parts, too like perhaps an engraved pendant, tattoo, or other marking that might normally be drawn without details in full-body shots. Dont forget to draw ears. Ears get overlooked quite often. See above. Im guessing Vin looks so aghast because hes missing an ear; that looks painful.)
I only have two facial expressions drawn here for example, but you should draw at least ten of the most common expressions for your character whether he or she is generally smug, fearful, excited, happy, angry, etc. Keep drawing until you think youve covered their entire range of emotions.