Looking good, good-lookin'!
I like this piece. My only qualm, and maybe people are alluding to this when they say it "needs more" without telling you what "more" might be, is that there is very little value variety in the hair which makes it flat. Certainly, it's convincing in that it has varying hues, but the highlights could be brighter and the shadows could be darker/cooler... they'll intensify each other really nicely.
Otherwise, I actually think you have very good command of digital media portraiture. The details seem to be done with great care. Awesome work!