Might I suggest you restrise your layers and enable anti-aliansing....in that way you get a sharper shape.And, use a bit of bevelment, and feather your reflective surface on your iPod Nano so that it has a more beleavable surface.And, this is a common mistake you have made that many people do, reflections arn't as clear as the actual object, so reduce the inverted ipod layer's opacity a bit and maybe use some blur for a more realistic reflective look.
I keep making Ipod models in PS in my cinematics lab, so I have alot of tips and trick