The sleepy look of the eyes is the main problem I have.
Current

Benchmark

When you zoom in really close, you can see that the eyelashes are the same length in both, but the current version has a much clearer boundary between eyelash and eyeball. The shading in the benchmark version leaves that boundary much blurrier, which gives the illusion of thicker eyelashes/more closed eyes. The shine texture in the current eye also is bisected by the eyelash, which sets a very hard boundary; without a set eye shine the distinction is lost. Finally, the color of the iris itself is also darker.
So I made his eyes a shade lighter, and rotated the camera around until I got some shine in his eye. Unfortunately I didn't get it from quite the same angle so the shape of the eye looks different, but he looks much more awake!
