elstat, ed pretty much nailed it. look around on the net and understand aperture (it's affect on depth of field), iso (it's affect on grain) and shutter (effect on motion) and you'll be good.
i understand in some sense, maybe if the photo was exposed better towards what ed did but im just getting at is that that looks like obvious after editing in photoshop where the sides look choppy and such from such bright contrast/saturation