What's wrong with this image in technical terms?
I will give my opinion and then hope rickey336 gives his opinion too. It appears you have used a fisheye lens. Not a good idea for this subject. Why not is clearly seen in the brackish brown water in center-foreground as out of focus. This lens loses the definition of all objects in the photo. To the general public, it looks as if someone has painted the golden brown in the middle of the beautiful water and destroyed the calm and balance of the photo. A potential buyer would be put off from paying for this only to clean it up - which is impossible at this point. I do not see much to be saved in this photo. I do wonder why the lens was deliberately used. Best regards, JH
I think the white balance (colour temperature) may have been an issue - that comes under 'technical reasons'. I don't think the fisheye lens is an issue - and to me it doesn't look like a fisheye 15mm lens was used, but a wide angle lens! The brown to me is part of the composition, isn't it? So, I don't think that was the issue as well.
So, try decreasing the colour temperature and increasing the tint just a bit, so it looks a bit more balanced. The difference can be very subtle.