Hi Lowepro,
Welcome!
Your photo is very nice.
A wonderful scene, beautiful light and colours, wonderful trees framing the canal and emphasising its shape, and I especially love the silky water and its reflection.
It certainly doesn't need any fixing up (ie there is nothing WRONG with it), but there are certinaly a number of ways the same scene and image could be approached.
I agree with StudioJ in that I think the sun is perhaps a bit blown out and distracting. I understand it would be almost impossible to not blow-out the sun yet still have enough light to keep the foreground visible, but in this shot I don't think the sun itself plays a major role (but the light it throws out certainly does).
The triangular shape of the canal with its heavy base demands attention, and my eye naturally wants to travel from the bottom of the triangle up the its apex following the canal, and the wonderful reflections you have near where the canal meets the horizon is a great place to lead the eye to and it works really well... but the sun is over there on the right of the image screaming for attention and fighting against the canal, preventing it from "working" properly.
I say get rid of the sun altogether. It's nice, but the river is way nicer and should be the primary focus of this shot IMHO. In fact, seeing as the sky is reflected in the river anyway, I would even suggest getting rid of a fair bit of the sky. Fortunetely I think the most interesting part of the sky is close to the canal, so by cropping out bits of sky you are still keeping the best bits and leaving the impression that the rest of the sky is as spectacular as those parts you are keeping.
I hope you don't mind, but I took the liberty of butchering your image in photoshop to give you an idea of how I might tackle that photo if it were mine.
Nothing major, just a different crop, a bit less exposure, and a touch of vignetting to give the sky more of a feel that it is "closing in" (and I also cloned out the bridge, which was distracting me a little bit too).
Now I have a bit of a love for dramatic skies and tend to prefer a more underexposed look than most people here I think... so my changes might not be to your (or anyone else's) taste... but I'm just saying what I would do if I had taken the shot myself. And as for the crop, well its a shame to lose some nice parts of the photo (especially those other bits of sky), but it is the canal that is the centre of attention in this shot, and as far as I'm concerned everything else is just incidental and there to support that element.
This is a critique so I'm trying to be critical, but as I said, the image is still great as it is without any changes.
Cheers
Adrian