Quote - i think m any of the times, my problem is also with camera angles or with composition of scene. I need to put objects and environment around the characters but it doesn't feel like the way i make my environment is realistic.

With regard to this the most Poser cameras are parented to the centre of the scene (exceptions are Posing cam, parented to the figures hip, face and hand cameras to the head and hands) This can make following motion and moving round a scene difficult. the only "free" camera is the Dolly camera. A solution is to add a primitive from the props library to your scene and parent the camera to that, then move the primitive not the camera, remember to make the prop invisble when you render so that it doesn't cast shadows into your scene.

Looking back at your punch picture,as others have already commented it looks a bit strained, remember that any movement affects more than just that part of the limb, so try always to adjust all parts slightly rather than say getting the arm in place by shifting the collar which is how that pose looks to me. Acting out is the best way, try to feel where the pose is driven from and how it affects the joints above and below it. Based on Poser's default animation speed, a single frame is capturing 1/30th of a second, so if you act out you can try to choose which fraction of the motion you want to capture.