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It has nice overall subtlety. Maybe a yellow trail just above the glittering spot in the ocean distracts a bit. If the yellow trail could be replaced with the gray tonalities of the sea and rest of the horizon, might appear visually more pleasant.     

Goran,  We've also been to the Oregon dunes near Florence, OR.  I think you have at least two images here.  One is what you have, a seascape and dune-scape.   The other would cut out the water and just capture the dunes and sand.  It looks like you have some nice shadows, so accentuating the sand might make an impactful image.  I also like the foreground trees.  You have some possibilities to experiment with here.  Best to you.  Larry

Here's an example of the cropped version.  Larry

Thank you both for your suggestions.  It's amazing how a crop changes the whole feel of the image.  I do like it.