How to improve your photo
To broaden your depth of field, use a smaller exposure, e.g. f/11 or f/16, and move the focus point to approximately 1/3 of the way in from the bottom of the frame. Consult the DOFMaster online depth of field charts at http://dofmaster.com, where you can see the actual depth of field specific to your camera, lens, aperture, and focusing distance.
Use a tripod for landscape photography, as you'll be photographing with slower shutter speeds to help render broader depth of field via smaller apertures. This will also provide added stability to ensure a sharp, in-focus frame.
Visualize the light for your chosen scene by using the Photographer's Ephemeris to determine the optimal time of day to capture this scene (sunrise/sunset) to improve the color, contrast, and shape. Then watch the weather and in this case, the water levels, once the lighting conditions match your vision. It sometimes takes many visits and many pixels for everything to come together perfectly.