I need help please :(

Shadow. Are you using ray-traced shadows? You can go into properties or parameters (can't remember which tab) and increase the shadow samples.

By the way, is this on another planet? You have three suns. (Two as lights behind the camera, and one evidently in the sky behind the chair.)

good point bagginsbill LOL.
But I am still learning lighting and don't know how to set up a single "sun" light, and it look realistic.

it appears to be default poser lite set: 3 directional (shadow-map) and one IBL.  I can't see grainy shadows on ball.

And it's the properties tab.

Thank you by the way. I increased it to 50. And I took out the other 2 lights and have just the 'main' one. The graininess has gone away. Now I just ned to work on setting up that single light so that it looks right lol.

Thanks again!

While a single light is best for sunlight you really should also be using the environment sphere especially for outdoor renders.   Head over to BB's free stuff and read all about it.   Your renders will thank you :)

https://sites.google.com/site/bagginsbill/free-stuff/environment-sphere

so... I don't need any lights? just the env. sphere???

If it's cloudy you can use the sphere only,   but use the sphere with one infinite light for the Sun.

Quote - so... I don't need any lights? just the env. sphere???

As long as you're using a version of Poser that has IDL.   Do a search in the forums here and you'll be sure to find a plethora of information on lighting with the Env sphere or emitters.  

If it's a bit daunting at first you may want to try the Sunlight product at RDNA which has it all set up for you but you really should read BB's tutorials and try out his sample scene.   When you have total control of lighting your scene you'll almost always get the results you want.  Oh, and pick up BB's light meter too.   It will help you light your scene correctly and avoid overexposed or very dark renders.

http://www.runtimedna.com/SunLIGHT.html

It's too dark :(

Add an infinite light for the Sun....

And set the infinite light intensity to approximately 80%.

"80%" - yea sometimes. Other times it should be 200%.

It depends on whether you're simulating a camera exposure set for shade or for sunlight. If you are "photographing" somebody under an umbrella, the exposure will at least triple, possibly more. Depends on the ratio of ambient to direct light.

To produce the same effect in Poser, which has no "exposure" dial, we adjust the light intensities instead.

in addition to above, try increasing specular on sun light if things aren't shiny enough.  increasing intensity (diffuse and specular) may result in too much diffuse.

The shadow looks fine to me. The problem seems more the highlights on the ball. I would look at reducing the specular values on it, maybe reducing it to something like 0.1