I lifted this from one of my other posts. If you're using depth map shadows, try cranking the dmap resolution up for sharper shadows (1024). If you want softer shadows use a smaller Dmap like 128 or 256 and increase the dmap filter to 2 or 3.

If you're raytracing and want a soft shadow, adjust the light radius and increase the shadowrays a bit...maybe start with 7 and go up or down from there. Be aware that increasing light rays will increase your render time.

You'll learn alot by just adjusting the attributes a little bit and rendering.