The importance of a levels adjustment in Photoshop cannot be overstated in my view. The ability to make fine adjustments to the dark and light areas of a photo and then tighten up the contrast using the levels adjustment is something I do on virtually every photograph. Levels can also tweak the colours ever so slightly and in fact the levels can be adjusted on a colour by colour basis. It's a very powerful tool. There's an 'auto' levels correction feature that I'll usually click on just to see the effect. With unusual photos like this one the auto feature can yield a startling but quite appealing result.