Hi Tom,
I would agree: the best overall commercial likeness to date is the old 54mm Cameo portrait figure.
The Eduard figure is one that IMO has not received enough attention--or due credit. All the basics are there: it just needs to be tweaked here and there with a bit of putty to get you "home". It's a shame they did not decide to cast the head in resin, as I have a feeling the master is just about spot-on. Given the price, medium, etc., it is also the one that lends itself readily to the modeller's creative touch: I have already reworked the hat and repositioned the head; am in the process of resculpting the latter; ground-down the boots to accommodate leggings; and removed the Geschwaderstock (weakest aspect of the kit) so as to replace it.
The problem with MvR--indeed any portrait sculpture--is arriving at a plausible synthesis of the available references, graphic and textual. The underlying skeletal structure is thankfully readily evident and constant: the cheekbones, the strong jaw, the angular nose. Melding the hard features with a convincing layer of soft unifying flesh is where it gets to be "fun". As I indicated, there is a wide divergence between the studio shots and the casual, "in the field" shots; and the temporal setting needs to be considered--you well know how quickly most of these men aged before the lens of the camera!
Finally, the bane of our endeavor: reducing the likeness to a recognizable miniature without resorting to caricature. All portraiture is a composite of defining features, but IMO there has to be something more. In short, what I strive for is the "complete" picture, as opposed to relying on the viewer to jump to the conclusion of who the subject represents by virtue of preconceived, instilled notions and/or how the subject is "packaged". The larger the scale, the more the sculptor can work in the realm of reality; conversely, the smaller the scale, the more one has to exaggerate the "key" features that trigger recognition. As you so rightfully pointed out, it's an artform all to itself.
As to commercial figures, I believe you've covered them all save for the late Jim Payette's 120mm rendition for
Model Cellar. I remember fondly having some rather spirited discussions with Jim when he was sculpting this piece. Good times. . .
Not to get into a sidebar discussion re: the marketplace, but I respectfully disagree. All we have to do is look at the recent releases of this subject to underscore that the market is less concerned with what lies inside the box, than the title, the manufacturer's logo, and the boxart. . .
Good chatting with you!
Augie