EF had a point here so I'm showing comparison shots.
The best side by side comp is a bare head but I don't have any bald head to compare, all had hair which can be deceiving. The best I can compare it with is the head from a red ninja. Here goes...
First up is shock wave.... Overall head size is similar. At eye level both forehead are pretty much the same. Vertex of the skull is at the same height. The face is a bit "plump" with SW which I did on purpose.
At side angle....Here you can see the silhouette of the ninja head from behind. Take note the almost equal "step" on the forehead then you have the slope transition to the top of the skull which is the vertex.
Next stop is Barbecue. Obviously he is wearing a helmet so proportions are off (helmet would be a bit bigger) but the key is to balance a bare head's proportion to fit inside the helmet. The vertex or top of the head is with the contour "dome" of the helmet.
Side elevation comparing the forehead... You can see the step transition (or slope) from forehead to the top of the head.
Now for the interesting part.....
I took MB's head to show the difference. Surprisingly his face is massive and very prominent.
On the side comparison of the stock red ninja sculpt you can tell the difference with the face.......its very big. And it lacks bulk on the occipital area or the back of the head.....Talking about disproportion here. I know that the skull of an individual person can vary in great length so this is not beyond what is normal for a human anatomy. But I think the red ninja is better balance.
This is the top view showing the lack of volume of MB's occipital area. He might have problem with his balance or vision with a compromise occipital lobe and cerebellum.