After a few days of heavy rain (that caused terrible floods in central/southern parts of Serbia), water in this lake is cool and refreshing. Lake was formed as a side-effect of a sand digging that started around the year 1970, and nowadays represents the most significant recreational/touristic...
Don't change anything - judging by these two photos, you're doing well. Maybe a bit more of background blur (wider aperture=narrower DoF), but it can be done during postprocessing too: