I think that this coin speaks volumes:
http://www.khm.at/system2E.html?/staticE/page631.htmlYou can see that they had the ability to do good work, but you can also see that this is only an improvement on a stylized tradition. The outline of the face, especially the nose, can be found on silver pennies of the preceding centuries.
I believe also that Bill's point is cogent. To me, it has been too easy to pass off the art of the Dark Ages and Middle Ages as being crude and uninteresting and then to excuse that on the ground that those people did not value life on Earth. That is true, of course: they did not. It would be 1000 years before Hobbes would declare life "cruel, brutish, and short" but that sums it up well enough for the Dark Ages.
Nonetheless, I now consider that to be necessarily unfair. The coins (and other artifacts) of ages past still existed. One of sad ironies of the Dark Ages is that those Germanic warlords -- the Gunthers and Hagens and even the Siegfrieds -- amassed large piles of gold and silver "stuff" like dragons guarding hoards, while the world around them perished from poverty. They did not know how to turn money into wealth. But they had the money -- and the goblets and the plates and the jewelry -- so they knew what it looked like. It was not that they
could not reproduce it, but that they
chose not to.
All of this is to say that if you can divide the timeline into artistic styles -- (Romanesque is an easy one: look at the court at Aix-la-Chapelle) -- then will find necessarily that the coinage follows the same models.
We do not pay much attention in the mainstream to money as SEMATA as symbols or signs. If the die cutter is working for a living emperor, then the portrait will be more lively than if the cutter is merely
attaching a
sign to an object. (Old traffic lights used to have the words STOP and GO cut into the lamp. Now we know what red and green stand for and we don't do that anymore.)
Another analogy is that when literacy was lost, rulers did not sign their names, but used a MONOGRAM which they could copy and which stood for their names. I believe that many modern Germans still do this. I have seen businessmen and engineers who put down some fancy scribble on a piece of paper and then, realiizing that they are working with Americans, laboriously write out their actual names. Are they illiterate? ... or are they only following a tradition?