You should probably edit your first post with the correct link ;) Anyway,
I like it! there's a good sense of shading, and it's definitely better than my first digital painting (But saying that I couldn't draw, but anyway)
My critique would be to say, work on soft vs hard shadows a little more, and try to blend the values a little better. I'm looking at the forehead, nose etc - basically if there is a really light value to a really dark value in short space, then you probably need to add more values in between to make a smooth transition. Also, I would say the colours are a little muddy - and that is probably because you've gone into the black range to make it darker. Pay attention to shadows - shadows are necessarily black. In fact, shadows (dependent on the skin colour) are dark red or blue. Even highlights are not predominantly white in colour - they normally have a tint of a colour such as yellow, or blue (dependent on the light source)
Finally, a bit more polish on the ear, and the hair is confusing because there are highlights in areas that should be in shadow - which adds to sense of it being a little flat. But I do like the shadow that comes from the neck down onto the jacket - well done!
Overall great job - keep em coming! :)
Clym