Adjusting lighting parameters


Hello, I have somehow built a model (partial) which looks like a stadium. I have attached the picture for your kind perusal. The field ground has been textured. Now for a particular position, my model looks too much lighted as you can see the far half of the seats look totally white. I am a bit new in modeling lighting. If I don’t consider the specular parameter, my model looks dull and seats are not properly outlined. So I added some specular component of light and shininess to the model. But the far half of the model looks too much lighted. I found textured portion is unaffected by lighting. Could any one explain why?
Could any one suggest how can I adjust the lighting parameters so that model does not look too shiny and seats around the field are also properly outlined.

Thanks in advance to all.