I think that this photo has been taken at night and this might explain the blue saturation of the sky...
My guess is it was the so-called blue hour, i.e., the time after dusk, but before the sky turns pitch black, and the sky then can
turn very intensive blue. Not sure if this is the case here, or the saturation was jacked up a bit too much, but slight adjustments to hue (perhaps a tad more magenta?) and saturation might turn it into a rather convincing shot. Otherwise, a fine composition, and yes, Pete Turner colors.
Not sure about the highlights around the cross... where does that come from?