Well, you are beyond my skills set now, my son.  I can no longer help you.  Go forth and render ....

Seriously, nice job, but I'm a Poser 7 user and have enough trouble with the more limited render settings of that program.  Someone else needs to step up with further advise on the artifacts front.

I'll keep an eye open for further examples of your work though.  Again, very nice job.

Rªnce