To me, the white in the picture appears to possibly be a reflection from a flash attachment on a camera. Some of the flash units in those days had plastic light diffusers over the actual bulb that would have appeared white if sunlight was reflecting off of them. I used to own a flash attachment that was just like that. The movement also appears to be the action of someone about to take a picture, moving the camera up to their face to look thru the viewer. So, did LHO have a camera with him at work on 11/22/63? We do know he owned a camera. Or, this could just be a photographer from the press. Or, just an ordinary citizen with a camera who went up on the steps to get a better vantage point for his/her camera. At any rate, I believe the "white" is some sort of sunlight reflection.