When lined up, the eyes, nose, and mouth will usually form a T, more or less, with lines drawn between them. Some variation is allowed, as most people do have asymmetrical faces, by not by too much.
In this picture, his features seem to be on different planes, and are off considering the shape of his head--which is also slightly off. It almost looks like he's looking down, but his eyes don't match up.
Though I highly recommend getting a better reference than my redline, this is probably closer to what you're looking for. Look at yourself in the mirror in a 3/4 view. Though you're not drawing realism, it really helps to reference it or at least a semirealistic manga/cartoon style. Like DC comics or Vagabond.
For proportional heads, I like to use George Bridgman's method: draw a cube and work from there. A cube is good for measuring symmetry without whipping out a ruler, and is easier to draw proportionally from than a simple circle and lines. Of course, this can make your heads look a bit stiff and mechanical, but it's all a matter of learning to use it.
The blocking method can be used for anime and cartoon heads as well.
Though I say that and though I prefer Bridgman's method, I won't tell you that his is better than anyone else's. I find that it works well for me, and it may or may not work for you.
Also, you can use blocks and rectangular prisms for the rest of the body as well.