Thanks for the comments. I think you're probably right about needing more fill on the top. I like that there is some shadow/light contrast though. I held a silver reflector in my left hand while taking the pictures, reflecting light from a studio lamp about a meter away. Should probably have moved that a little closer.
Regarding the display, if this had been a real assignment I'd have done like the pros and made a fake display in Photoshop. I don't think there's one cellphone promotional photo anywhere that actually has a real picture of the display.
Another thing -- I love shake reduction. The picture of the lens was taken handheld at 1/20 sec and is TACK sharp.