Using the wonderful freeware Xnview,
www.xnview.com , I took the picture at the left, decreased the "gamma", which darkened it, and added a touch of red.
It looks pretty much like the darkened picture in the first post.
Although there is a brightness setting, the "gamma" darkens it as well, so that is what they did. Plus added a touch of red, for some reason. Note the difference in color of blue in the background.
I don't know that much about graphics, but that would seem to be deliberate.