This is a bit of a long shot, but there was an old pixel artist here on TB known as fawflaw. He made some amazing sets and heads, and I'm hoping to find some piece of his artwork, even just for sentimental reasons.

If you have a head made by Fawflaw, or a well made pixel-arty head or set, offer up. I'm willing to spend up to 40k.

Here. Try following up on who Fawflaw sold them to in this thread:
http://forum.toribash.com/showthread.php?t=116022
And, then PM the people he sold them to in the thread, and see if they might have the head, if not, ask who they sold them to.
Hope this helps.