The hard part about rendering a SIlver Surfer Character is deciding what's getting reflected. 

The SIlver Surfer will look different every where he is huh?  The answer is yes, because he'd be reflecting his surrounds where ever he went.  If her were in a blue room with blue walls and a blue floor then he'd be pretty blue, if he were on a ski slope on a cloady day then he'd be very white, or if her were really out in space he'd be mostly black with white spots(star reflections.)  This, in Poser would be represented by your Sky Dome, Atmosphere, Objects, or Reflection Map. 

BTW - If you want to cheat a little and do actually want to make him appear the same, no matter where he is, then your looking at adding a Reflection Map.  This is done by plugging an Image_Map node into the the PoserSUrface Reflection node, and then setting the Diffuse Value(and I think Refraction Value) to zero.