Hi Ashleigh,
Photographing waterfalls in the middle of the day doesn't always guarantee you'll create the best shots, but it's a reasonable way of learning about the shutter and shutter speed.
On its own the subject is rather boring, but if you were to spend 10 minutes or so making photographs of the subject atdifferent shutter speeds you'll get a really good understanding of how it can be used to freeze action. To do this, set your camera to its lowest ISO setting (100 ISO) and put the camera on to shutter priority mode. Then work your way through the shutter speeds noticing what happens if you make the shutter speeds faster (as in 1/1000th of a second) and slower (1/60th of a second). if you want to go to slower shutter speeds, try putting on either a polarising filter or a neutral-density filter.
What I'd be more inclined to do though, is to go back and make more photos when the sun is shining at a lower angle on the fountain. This might mean taking photos in the early morning or late afternoon. Try shooting from the opposite side of the light and zoom in, looking for interesting patterns in the water... I think you will be surprised by what you can achieve.
I would also be looking to drop an additional element into the picture and one simple option for that might be silhouettes of people.
As for how to improve this photo; in Photoshop I would simply use the Spot Healing Brush Tool to remove that lamp post in the background. That will be one less distraction, and it will let a viewer concentrate on the water.
Cheers for now, Anthony