f/22 because you wanted to focus on the foreground, yet still the whole thing as sharp as possible? I think it may have been better if you just had it at f/8 or f/11 and focused on the rocks, because right now they look a bit soft.
The sand also looks a bit overexposed on the left. Is this on purpose?
Thanks for the thoughtful comment; I used f/22 mostly as a replacement for an ND filter. I wanted to slow the exposure down, and that was the most effective way for me to do so. As far as the sharpness, I've actually uploaded a higher quality version -- the focus was pretty well hyperfocal, and f/22, from my experience, with a 16-35mm lens and a Canon 5Dc, doesn't seem to hinder sharpness as much as one would expect. Generally, I agree with you, however, and rarely exceed f/11 as to not limit sharpness by means of diffraction.