Based on my experience with Poser 7 and Pro, I would certainly say don't use texture filtering (I see you were not using it for your test render settings).
Try a spot render with an increased render size, or with decreased minimum shading rate. Either of those should render the tattoo better at a distance.

"If I were a shadow, I know I wouldn't like to be half of what I should be."
Mr Otsuka, the old black tomcat in Kafka on the Shore (Haruki Murakami)