or you can change it from a buffer shadow to a ray shadow
whenever you use light to render a model, i recommend just using the sun instead.
and to make it look even better, go into the world options
and turn on Ambient Occlusion and Environment Lighting. Then change the blending mode for Ambient Occlusion from Add to Multiply. (then maybe adjust the slider for environment lighting cause it might be a little too bright) and if you scroll down you can also increase the samples for the ambient occlusion so it doesn't look like static