After thinking about my Superman's "weird head" off and on over the weekend, it fairly quickly came to me that part of the oddness is due to the fact that the basic proportions are wrong.
It's a good rule of thumb in facial anatomy that the distance from the chin to the center of the eye should be roughly equal to the distance from the center of the eye to the top of the skull. In this regard our Kryptonian, as modeled by Revell, is rather seriously deficient:
His hair on top is noticeably flattened. It's almost like they molded him with the top of the skull lopped off, with a little hair brushed over to cover it up.
I did a quick, very crude lashup in MS Paint to alter the Satanically-arched eyebrows, and add a little profile to the upper part of the head, and this is what I came up with:
I think it's a bit more "normal" looking, at least for a non-human alien. On the downside, it exacerbates the chief problem, which is that Revell's re-molded head is too large for the old body, to start with. But one problem at a time.
While I'm performing the required surgery, I think I'll add a little tendon definition in the neck, as well.
(BTW, Tim, thanks for the tip on the Kneadatite putty.)
Up, up and away!