replicand, the usual way to improve a render in carrara is for the user to post a screencap
of said render and lite settings.  then if there's no full ray-tracing, fast shadows, no indirect
lighting, no photon mapping et al., we would tell him to fix those, but it takes almost an
entire manual to describe everything.  same goes for poser.  if he posted a screencap
of some posersurface materials shader trees and we saw that he didn't use an AO node
on everything, we could tell him to do that.  if he didn't use bill's new lite-probe tool to generate
a light to fit the scene, we could tell himn to do that.  we could also tell him to activate the
GI variables which enable indirect lighting in FFRender, but said function is not supported yet
by SM.  all of these would also take almost an entire manual to describe properly.

the idea IMVHO is to encourage the user to try all of the rendering engines to see which
one gets the most pleasing results for said user, with default settings.  I dunno about vue,
but FFRender and carrara don't get their best results with default settings.