I did consider that. But, the keypad was the last part I made... On the phone itself, as I think/hope you can see, the keypad isnt flat, its kind of wavy with smooth grooves running across it above and below each row of numbers. I didnt have enough space left, when modelling the keypad to make geometry 'groovey' enough to cast its own form describing shadows, so I needed to get that information across in the texture. I knew nothing I could have done manually in photoshop would have been as good as the real thing. So it was a compromise I guess, between having the tonal variations of the light on the surface,and having the numbers themselves. If that makes sense.