Okay, first off I really like the picture. The X100 probably isn't the best camera to learn on due to its fixed focal length but it will make you work harder to get a good shot. Since it is pretty wide it's hard to isolate your subject in the photo. You're going to learn to move around a lot!
For your photo below, the first thing I did was to level it. Water should almost always be shot even. If you don't have it activated, turn on the custom display with the level indicator working. I use that all the time. It's a real handy tool.
Once it was level I cropped off both sides. I removed the right side because it had some random items that were distracting. I removed the birdhouse from the left side because I didn't feel it really added anything to the picture.
I also cropped a little of the sky off for two reasons. One, since it's white with no color it's really bright and distracts from the subject. Two, I wanted to keep the picture a rectangle to keep a feeling of length along the river.
Next thing I did was to warm up the white balance a little. It was blue from being shot in the shade. This probably gets it closer to what you were actually seeing. Your eyes are still better and correcting for white balance than any camera made.
The next step I took was to darken up the left side of the photo where the river starts to go around the bend. It was too bright and was pulling my eyes off of the main subjects.
Last thing I did was add a little curve to the Tone Curve in a gentle S shape to darken the shadows just a touch and brighten the mids slightly.
Notice what you have left is a nicely balanced photo. You actually have three main subjects. The tree with the heavy bark on the left which kind of pushes you over to the right to look at the boat in the river which in turn leads you to looking at the long building. This in turn will push you back to the tree.
These three subjects are in a triangle which keeps the viewers interest longer because you will keep switching from one to the other. This helps to make a picture look more interesting to the viewer. If one of those were missing your eyes would probably be more likely to leave the photo. If I hadn't darkened the far left it also would drag your eyes out of the photo. Thanks for posting this photo. Really nice. As you learn about composition you'll be able to do this more in camera.