I think I would have cropped it down to remove the stones on the bottom left, the horizon would have suited being in the middle more if that stone area was not there to give a nice reflection but something looks slightly strange how it currently is. But other wise nice image.
GIMP: I cloned-out the shore, bottom-left; also added duplicate layers (multiply), graduated top and bottom with linear masks. Dodged the grasses/reeds right, and more distant left. Desaturated the picture slightly and boosted mids in levels from 1.00 up to 1.15.