I added a number of adjustment layers: a black and white layer, a brightness/contrast layer (raised brightness, slightly more contrast), and a colour adjustment layer, to split tone it with blue shadows and yellow highlights (with the preserve luminance button UNTICKED). Also a lens correction to remove the slight vignette (which is unusual for me!).
I added a border, and then finally I also applied a gaussian blur to the outer edges of the image, to draw attention to the centre.
This is my first WWYD, so I hope you like it.