In your example image it would appear that you don't have any bump or displacement maps for the skin texture (or possibly the lighting is very "flat" - comming from the front and not the sides). As noted earlier bump and displacement maps will go a long way toward the illusion of realism.

Also, as noted above, the bottle, and the jewel in the ring, are also problematic. Anything that has caustic lighting effects in real life, like glass and jewels, will be difficult to create the needed realistic effects or illusions in Poser. For this reason, I would recommend against using any jewel or glass props in your images, because it is so difficult to fake the proper effects using Poser/Firefly. If you really want to use these props, then you should investigate using an external renderer. Reality 3/LuxRender or Octane Render might be your best solutions for caustic effects.

A very good understanding of lighting and materials/shaders is very important when trying to achieve photo realism in a 3D render. If the lighting isn't very good, then you end up with flat renders that simply don't look real. Materials and shaders that are even slightly off will leave the viewer in uncanny valley, where things are very close, but just don't "feel" right.

So, IMVHO, Lighting and mats/shaders are where you should focus your efforts to begin with.

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