I'm new to photography. I am trying to take a long exposure image of this nice water fountain with a Canon T5i.
How can I improve it?
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"What to improve" is a very subjective question. with that in mind:
one of my main dislikes about this exposure is the "burned" sky due to the long exposure. As your sky is somewhat similar in color to the fountain water, it reduces the emphasis from it.
As you are probably using a tripod, I would attempt to capture a HDR (high dynamic range) image to get a bluer tone to the sky. another solution which I personally have less experience with but should work as well is using an ND filter. Another solution is to look for a better composition: look for a different background.
To add to the other more technical points, I'd suggest changing the composition slightly. At the moment you have a lot of 'just' water in the bottom right. Moving the fountain down and right in the image would show more of the river (lake?) disappearing into the distance.
As a general rule of thumb, putting the main subject of an image in the centre of the frame doesn't give the best photo (exceptions obviously do exist).
Two things need to happen in order to get a good "long exposure" photograph.
The shutter speed you used works for this scene, but the camera isn't steady enough. To eliminate the movement your body imparts on the camera, use a tripod, or set the camera down on a wall or other stable surface. It is also good practice to use a shutter timer so that once you push the button to take the picture, any slight vibrations you imparted to the camera will have time to dampen before the picture is taken.