Well there no arguing that the girl shots are grainier than the lad's by a mile, Ted. Are these prints that have been scanned and if so do the actual prints have the same difference in graininess?

If they are underexposed then you'd expect the shot of the lad which has more of the window in it to be more underexposed than the girl's shots, I think.Maybe the lad's underexposure is somehow "neutralised" by the fact that overall the light is much brighter at midday?

Anyone care to comment on the above comment?