While I don't see anything technically wrong with you shot (in my admittably amatuer eye). there is a blandness (not wahsed-out) feeling to the picture, either the colours don't pop enough, or the hue is overall too green (even the pavillion is taking on the tint).
Either pushing the colour saturation up to get more pop between the different shades of green, or desaturating the green slightly to wash it out and adding in some colour for a secondary focal point (perhaps a forgotten red sweater on the pavillion bench) with the saturation on that colour pushed up. I can see a purple flower and a red (fish?!? maybe) in the pond. That lead the eye in a trail of colour to the pavillion, some colour at the finish line may have helped.
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