In regard to using Poser as a replacement for live human models, what you really need to do is use live human models as a reference to fix the problems that poorly-jointed, poorly-designed Poser models cause, particularly in the bending of the shoulders, elbows, knees, hips, hands, etc. Some new models, e.g. Apollo Max, are better designed than older models (Daz V1/V2 and Posette/Dork). Poser can save alot of time with a good model that has sensible joint bending, but check the result against an actual human, to avoid the telltale "Poser look".