Whenever an object isn't being viewed face forward, the angles are going to be foreshortened. This is most noticeable when looking at something from below or above. In this piece the blond is being viewed from a very skewed angle so his facial features aren't composed of the shapes you typically associate with an eye, a brow, a nose, etc. Look at each of these features separately and you'll see what I mean. Does that even look like a nose if it's by itself? Having a reference image to study and sometimes rotating the artwork really helps when tackling the unusual angles foreshortening creates.