Not to be a negative nancy, but I think the first reply was on to something, he simply stated it in a terrible way.
The lighting, while probably natural, has a really artificial look to it. I think it's a combination of the angle of illumination and the fact that delta 100 is so freakin smooth and demonstrates no grain.
It may just be my display (I'm not on my normal one now) but the upper mids seem to block up in that grey and then explode into blown highlights. At first I would consider this a result of the exposure but when it comes to pleasing skin tones one must also consider the lens in question as well as the film used.
Also, what's with the crop?