This needs to be seen fullscreen for the best effect. The contrast between the colours of the water and the sandstone is a real kicker, the contrasting textures enhances that further and at full screen it's well balanced. The curve will be the effect of the "wide angle" on your camera lens, I'm guessing you "zoomed right back" to fit everything in, which used the lens at it's widest angle length. It's most obvious with straight horizons or strong vertical lines in architecture.
Mikel.