I've never had the chance to see progress like this (before and after). Keep it up! If I have any crits, I'd just say this:
If you're drawing yourself from a mirror (or even if you're not), remember to try to draw the shapes/forms and shading that you actually see, and resist the temptation to draw parts out of your head. What do I mean? When I look at your eyes in the portraits, they seem to hint at being lighter than they are in real life (maybe you do have very light eyes, I wouldn't know). It may help to play around with using a broader range of values; don't neglect you shadows and dark areas/spots. It seems like you prefer to stay around lighter, subtle tones (there's not necessarily anything wrong with that).
Keep up the good work!
"Nothing worth having comes without some sort of fight." — Bruce Cockburn