Lighting, texturing and camera effects such as depth of field...ElectricAardvark is right on with his comment! We'd all love a "render photoreal" button, however this doesn't exist, because every aspect in every photo is different, the lights, the colors, the angles, the lense settings on the camera...getting a photoreal render takes a lot of work, and a lot of practice. Lighting alone will buy you alot in the line of realism, closely followed by textures ;) -Modulok-