Oh I imagine that as you see in my explanation... but I should had voted that low I probably miss-click the list, the face is good enough for a 6-7 , so lighting/picture is making it worse than it should be. I also had a peek at your gallery and your painting is MUCH better than a 4... so to redeem myself will upvote to a 7.
And sorry if I sounded harsh or rude, I am here to have fun and comment what I think in a positive way. ^^
Sorry, it actually HAS grey highlights and shadows, but what it lacks is proper lighting for the photo. I shall try to get better lighting for a re-shoot.