I must say
I am impressed. There are some flaws, but they help make him look more real. The flaws do look like something that would happen in real life. The only thing I would have done differently was not shade anything that was part of the same item at the same time as the rest. You did well with going back over and seperate everything, so I will forgive... for now.
I hope for your sake that you have saved a copy of this with just lines.