That photo was doctored/manipulated in some way, no doubt about it. Either they used camera tricks or they directly doctored the photo itself.
A change that big, in 6 weeks, just from physical exercise and discipline?
Easily possible for a healthy young man with the right genetics. While it's an extreme case, in that it involves a man who went to become Mr. Olympia, a 19 year old in The Colorado Experiment gained 63 pounds of muscle mass in 28 days, without the use of drugs. The Colorado Experiment: Fact or Fiction | T Nation
If you consider that an upper bound, the amount of muscle gain needed to produce this facial change would likely be just a small fraction of that -- easily possible.[/quote]