As long as it's both dynamic (ie takes the flow and motion from the original art while not being interesting when viewed only from the original concept angle) and doesn't seem entirely out of place in the line it's a good model.
a good example of a bad example would be anything that Tim Prow did. he managed to make every single sculpt that he touched not only demonstrate a complete lack of any knowledge of physiology but also had entirely two dimensional figures that obviously were only vague attempts at giving depth to a concept art sketch.
You can go too far in the depth field too. The Cursed Legionarres, some of the last Target models out of the molds, were spot on to the fluff art, but given a lack of artistic liscence seemed entirely bland and almost playdoh like.
So to answer your question, make the models look good from all angles while being true to the original concept if not exactly it...
...or we'll hate you forever.
(don't worry, from what we've seen of your work, it's awesome)
-PFC joe
one more example, the Brotherhood Assault Go-kart. The sculpter went EXACTLY by the painting, to the point mistaking the Statue
behind the Kart as being a part of the Kart. Thus, we have a really ridiculous, but funny to tell story, model on the board.
and even further
The Bushido Samurai
are perfect. I believe that they are Kev White sculpts and they manage to perfectly capture the spirit of the art as well as manage to look completly badass on the board.
