Hello, Miguel.F,
I do enjoy this photograph - it is excellent. I live in a seaside village in Oregon. The beauty of the sea is everchanging and enchanting. You have also captured the colors very well. I do see something on the horizon line that could use a little help.
The line where land and sea touch is vague and I would like to see the background mountains a tad darker. If you select the horizon line and sky, you might be able to change and sharpen just that section. If you have Photoshop you can easily use curves slider to do this.
Also perhaps the camera raw filter might help you change exposure in that section. In the left foreground, the white foam seems fuzzy because of the white being strong. Try to tone down the white there. Do try a few things and resubmit.
I hope you did look at this shot at 200% magnification to see the unsharp areas. Best regards, JH