Good question, so lets take the image and look at the deeper aspects of it.
This is the area of the picture where the face image is. Lets first look at the area marked by the red line. You can see a very distinct crop mark. This is an area where the shading goes from a slightly darker to a slightly brighter area. Usually signifying there is an overlay. That is the first sign that something is a bit strange.
Now lets look a bit deeper, look at the snow flakes in the area of the image. The snow flakes in the "Face" area are darker. If you look at the color density you can see that the whites of the snow flakes are 245/245/248 in the face area, versus the 255/255/252 of all the other snowflakes. The snowflakes are in the forefront, so they should be roughly the same average brightness for comparable sized flakes anywhere in the picture. But in that one area, they are not. That usually indicates some image was superimposed over the top.
I did look at the EXIF and ITPC header data, and it showed no sign of any photoshop manipulation. The data still showed the camera data fully in tact. But there are many other software programs which can retain original header data while manipulating the image.