The light is inconsistently portraid (as pointed out). I attached a version where I only slightly fixed this, but I considered the trees on the right to be in error.
I think you need to make the water much darker, and more reflective. Those highly saturated color strokes does not look good - makes it look unfinished. Try to avoid white for the highlights, always mix in some color (use a warm yellow for sunlight) - pure white looks unnatural. The trees need depth; I added darker darks here and there. To give it a sunny day look, I increased the overall contrast, and added yellow to trees, sky and barn (perhaps a bit too much here, it started to glow
There are still some bright white patches that needs attention IMO.
You have a good composition; the main subject is off center, and there colors are united. There are some counterpoint going on (pillars/poles and rocks on beach as an example).