Nice image! I went to school up there and used to visit Letchworth. Beautiful park! I love the water here, it is IMO not too silky but also not too choppy. I might be tempted to crop a little of the foreground so it's not quite so dominant to draw the eye more towards the main falls. Right now I see the image sort of in three "blocks" top, middle, bottom. If the bottom was cropped more, it would emphasize the falls a little bit more and break up that "blocky" appearance.
I feel the exact opposite. A landscape is usually supposed to have three layers to it with a foreground, middle ground and background but the fog in the background throws me off for it looks like it comes out of nowhere. I would keep all of the colorful foreground and crop the fog off the top. I do agree with the point that the foreground dominates a bit if the waterfall is the center of interest so I would've used a wider aperture and blur the foreground a little so the eye is drawn to the waterfall and the colorful background is also blurred a bit which the crop itself would put the waterfall in the rule of thirds and the colorful foliage would be more of a frame of the waterfall. That's just my opinion. Beautiful image though.