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This is a great shot. It makes a great minimalistic composition. It is because I really like it that I want to add some suggestions that will make it even better.
1st, level the horizon. It looks like the umbrella should be leaning to the right a little bit, which will make it more interesting. Also the shoreline will be more of a diagonal line, which is also a plus.
2nd, balance the composition by cropping in a little bit on the left side and top. This will move the umbrella a little more off-center.
3rd, give the image a little more tonal balance by having the umbrella shadow a little darker to match the dark sea.
4th, maybe back off some on the dark vignette. I prefer vignettes that are a little more subtle.
I know this isnít the critique forum, but I think you have a very nice image here that deserves special attention.