I think it would be tough to get decent likenesses with Dork. Not enough polys, not much of a selection of textures (unless he has a stash from the old days, which is entirely possible.)

I found V3 and M3 the easiest to get likenesses with, actually. I think they have more polys in their heads, or they're arranged better, or something. Not that many textures still available for them, alas, though I still use them sometimes.

If you are able and willing to use multiple figures, it might help to start with a default shape closest to your target. Several Trek fans I know have noted that Michael 1/2 is relatively easy to turn into Mr. Spock. The shape of his head is more like Leonard Nimoy that other figures.