This is a topic I've thought about, and I think Quoom was highly skillful when it came to his female victims, but I think his torturers are deliberately much less attractive since he was using low-resolution models to keep the image size down. I think he may have used Poser to set up his scene, but I think he was using a different rendering engine - Octane, perhaps. And keeping the image size low would be necessary to keep down render times if he used a reality based render engine like Daz's Iray or Octane.
Your point about Quoom's brutality is well taken, and, while it was the reason I subscribed to his site, it might offput anyone who tried to pick up his ball and carry on. Especially if they tried to finish any of his unfinished series.
But there's another thing that I think makes it unlikely any artist will ever continue what Quoom started, and that is that they likely will not be able to access the environment he used for each of his stories. By environment, I mean the torture chamber, the tools (some of which I think are custom designed), the lighting, and the 3D character models he used. I personally think that Quoom either passed away or suffered some kind of debilitating attack (heart, stroke, or something like that). If he is alive, he likely cannot communicate by email and thus his computer memory is impossible to retrieve. Having done some 3D modeling, I know how difficult it is to get the environment to look right, and trying to replicate his scenes would be a monumental task even before the artist started trying to generate new images.
