You're right on whether the source of light is on the same or opposite side. I'm assuming the light is coming from above you and with respect to the view, in front of it. http://mdznr.com/bJ The way, I think, you're talking about is if the light were to be coming from the user's chest (certainly not what's expected and not in the HIG).
The part that's backwards about Apple's implementation is that tilting the device (roll) should rotate the shines and tilting the device (pitch) should change the size of the shines. Apple's rotates on pitch and changes size on roll.
You should also be giving those avatars height attributes. When some of them load in slower (Also, I see you're loading them @2x, essentially), it shifts the formatting of the page a bit.
The interface for iPhone and a lot of iPad apps would not benefit from a stylus. Buttons are huge. That Samsung device has teeny tiny buttons which requires a stylus. There are only two things I think that can benefit from a stylus and that is handwriting (do we really need to do this? It's slower, harder to read, and very constrained on a small device) and drawing (probably only necessary on iPad). Styluses also require you to hold the device in a new way. No more one handed use. You have to hold the device flat on a surface or in the palm of your secondary hand while you use this stylus in your dominant hand to point. Also, unlike a pencil or pen on paper, the small screen will not allow you to rest the side of your hand on a surface. I can't imagine how tiring it will be to keep your hand in this position for more than a few moments. I think you're mistaking something being different and temporarily fun to explore from something actually being better.