Sorry, I don't want to sound like overly critic, but the final product has nothing to do with the Masashi Wakui photographs.
It's still an interesting Gimp tutorial though.
It was inspired by Wakui's work, and attempts to produce a similar glow/bloom to highlights in an image, which it sort of achieves. The overall color grading could be pushed further, but the author wasn't looking to exactly match the style.