It looks like pixels from blowing it up too much.
No, thats not it.. here is the original. See how her nose looks almost cartoonish, there is no detail and seems to have a really grey tint..
The photo seems to be underexposed. Popular exposed image should have less noise.
Besides, according to the exif
Camera Maker: PENTAX
Camera Model: PENTAX K20D
Lens: smc PENTAX-DA 18-55mm F3.5-5.6 AL II
Image Date: 2010-12-27 02:20:46 -0400
Focal Length: 37.5mm (35mm equivalent: 57mm)
Aperture: f/16.0
Exposure Time: 0.0056 s (1/180)
ISO equiv: 400
Exposure Bias: +1.00 EV
Metering Mode: Matrix
Exposure: Manual
Exposure Mode: Manual
White Balance: Auto
Flash Fired: No (Manual)
I will shoot it with a wider aperture instead of f/16. In that case, you can lower your ISO. i.e. f/8 with ISO200. Or maybe even f/5.6 with ISO200 and keep the same shutter speed.