Ah, OK , coming from DS.
Lights are completely different in Poser.

Now did you go to the Light Properties and set the Shadow map at a higher value?
Your shadow preview will look a lot better if you do.
Set the Shadow map for that single infinite light (in the light properties) at 1024, 2048 or 4096. And naturally Texture display preview in the Render settings at 4096.

Mostly, for a render like this, (just one figure with nothing else) goto BB's freestuff in his signature, and grab the BB env Sphere.
Load that prop, and use only one infinite light at 60-80%
Select a render with IDL (option in the render settings)
Raytrace bounces at 2-4
Min shading rate at 0.2 and you will get a clear sharp render.

In the advanced material room you can also set the loaded textures for each material at "crisp".

And, with a smile, YES, please do read the manual.
PoserPro2012 comes with a nice 800+ page manual.

 

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!