Hello, Andy...I'm no expert on cameras, so I'm not sure of the capabilities of an iPhone 3GS. If I had to choose between "Toccoa Georgia Lake" and "Toccoa Georgia Lake 2", I'd have to go with the original. The colors are far superior and the vegetation is much more interesting.
Nonetheless, this posting is quite nice. I have been told that the amount of sky in a photograph should be reduced unless the sky adds drama to the shot. This sky is pretty plain; so I'll say that the shot should have been cropped to remove about half the sky. You picked a moody time of day for your shot. With the bright sky in the background, the remaining silhouettes are quite interesting. The water weeds add to the photo. There seems to be a lot of noise visible in the sky which again is rather undramatic.
Anyway, that's my take on your posting, and I'm sticking to it.
Nice serene feeling here. The sky on the left seems a bit overexposed. The pier would be a better subject of interest if it were not partially obscured by the dark trees behind it. I'm pleasantly surprised by the good resolution you got with an phone/camera.