What can I say? This piece really does capture the essence of an autumnal afternoon. The way that the clouds over the mountaintops contrast so spectacularly is fantastic and the shades of blue in the sky are displayed so well.
The difficulty that you experienced with the reflection could have been made a little "soft-focus", by adding some more ripple effects to the water's surface. From there, I would say that you could be symbolising an autumnal breeze, across the surface of the pond or lake. Perhaps some vegetation there would help as well?
Finally, looking at the trees, it would appear that you've drawn conifers, which are brilliant with one exception - they are evergreen, thus don't have the colours change and the leaves drop off... If I'm wrong, brilliant, but if not, it's just a casual observation that might cause a little consternation.
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