Boats in the people's park

I guess the main error is to have taken a vertical shot instead of

horizontal. what do you think ? thank you !

Yes, the top of the image does not contribute to the subject at all. From the top of the bush covering the left side of the bridge, there emerges a tree trunk. I'd crop down from the top, so that this tree is just not visible any more. I just have rated the image 5/4, and after the crop I'd definitively give it a 6/4. It's not very original, but, wow, what colors. I am also not troubled by the fact that you originally chose a vertical. Not seeing the whole, leaves place for imagination.

Being there I would really want to go nearer and go into all sorts of details, always trying to emphasize color complements, dominant lines, light and shadow. With all those curves and reflections from the water, this should be no problem. You could shoot a whole series of images at this fantastic location.

Andreas