Nice work. If you wanted some of the sharpness back. Try applying a high pass filter to a duplicate layer then set that layers blend mode to hard light. 3-5 is a good starting point for the high pass setting.
I was sort of proud of how much smoother I was able to make this guy, even though I know he is still pretty blurry. I had to blow up the image for a vehicle wrap, so you can imagine how much larger that would be. Considering, I just wanted to share because I haven't done retouching work in awhile, and I was happy with the slight amount of trickery I was able to pull off, haha.