I'll show you instead.
The composition is fine.
As I say, first of all, is the composition, it's upmost important. You have to shoot level, to keep the greatest number of pixels, in case you need a large print.
Meter the pic.. AV mode or whatever you use.
Shoot
Then edit
If you know about levels, your whole shot was very dark, or underexposed, except had a bright spot from the water itself.
An easy fix is to move the mid level, in "CTRL L" in photoshop.
Slide it left a bit, but not too much, you lose contrast. Then you can add some contrast back. You can then fine tune it under Curves, right click points on the line, and then VERY slightly move them up and down, getting a good balance. Be careful, easy to lose contrast in shots at any exposure point.
I also removed the noticeable dust spots with the clone.
Added some saturation, and + hue to bring out green.
Only a quick edit, but gives you the idea. 
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