I dont use Maya because I'm in love with 3d Max ( :D ) but here are some links that could be helpful: http://cg.tutsplus.com/category/tutorials/autodesk-maya/ http://cg.tutsplus.com/tutorials/autodesk-maya/quick-tip-how-to-enhance-render-quality-in-maya/…
You can improve your lighning. First what software do you use? Max, Maya, Blender? Some game engine ? Also you can work at specular and gloss: Table can have high spec with low value of gloss. On the wall you can add bump map/normal map. You can lighten the color of the ambient light, or add some ambient light. Also render…