I'm going to have to agree with Aeilkema's assesment of the mentioned artists. Just looking at the first page of thumbnails for each artist, I see postworked hair, bland expressions with minimum adjustments made to the eyes on occassion and sometimes a pursed pair of lips. Other than that, I see no life in the expressions.

You can't tell me RGUS does no post work. I saw only two of his images where the hair looked like it might have originally been Poser hair before some touchups. The rest of the hair all looked painted on to me. I have nothing against postwork, but it doesn't really bring life to a face for me. Life comes from the use of actual expressions other than dead-eyed Dick and Jane, or in these cases Mike and Vicky.

I'm certainly not saying these guys aren't good at what they do, but I don't see any X factor that brings their work to life for me.