the overall picture looks like it is lacking in contrast. the tree at the top could probably be cropped with out losing any of your main subject and wouldn't leave it half in and half out. i like the nice curve of the shore and the repeating lines in the water. appears to be a bit of dust in the R lower corner
Pretty nice prespective on this one. Possible improvements - remove the significant amounts of sensor dust in the upper right, adjust the levels so that the water is not quite so bright and smooth the sky so it is not so striated.