I think the sun is almost overhead, slightly to Kerry's left. The far-left guy---blonde---can't his shadow be explained by his head being tilted more than the others? I think perhaps it can.
That said, I am slightly bothered by that object behind Kerry and the guy in the white T shirt. It appears to be a tarp or cover over something, maybe a gun? But the top of it BLURS into what looks like water behind the boat. Could someone with photography experience explain that?
Yes, but what about nthe guy in the middle and Kerry. The shadows are quite different. The shadows in the picture as a whole appear to fall into the middle. If flash were used the shadows would fall to the outside. I think the photo is fake but I wouldn't want to have to defend my conclusion in a court of law based on a web pic. Here's an interesting DVD with the same picture on front. This might soon be a collectors item! :^)
http://samplecdstore.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=JK-BIA&Category_Code=