If there's something about a painting that simply doesn't feel right but you can't figure out just what it is, go back to the basics. Squint your eyes to check the balance of light and dark tones. Identify the major elements in the composition to see how they related to one another, and check if they work with the Rule of Thirds. Look at the colors you've used to see if there's something that doesn't sit comfortably.
In the original composition the rock in the center is a bit too much of a distraction, pulling your eye in too strongly and to the detriment of what else is in the painting. The options would be either to take it out completely (provided it's not a well-known part of a famous landscape!), or to reduce it in height (as well as lightening the tone). In the manipulated photos, it's been taken out completely and the tone of the other distant rocks knocked back a little.
Other slight adjustments that have been made are lightening the tone of the front bit of coast has a little as it was a little too dark, creating too much of a contrast with the rest of the coast and with the brightness of the horizon. And making the horizon line a little more more definite, so there is more of a distinction between the sea and sky. At the moment there's too large an area of very light tone that your brain has to work too hard to figure out what's going on. It doesn't have to be much, just a subtle change of tone on the horizon in to the sky.
In the original composition the rock in the center is a bit too much of a distraction, pulling your eye in too strongly and to the detriment of what else is in the painting. The options would be either to take it out completely (provided it's not a well-known part of a famous landscape!), or to reduce it in height (as well as lightening the tone). In the manipulated photos, it's been taken out completely and the tone of the other distant rocks knocked back a little.
Other slight adjustments that have been made are lightening the tone of the front bit of coast has a little as it was a little too dark, creating too much of a contrast with the rest of the coast and with the brightness of the horizon. And making the horizon line a little more more definite, so there is more of a distinction between the sea and sky. At the moment there's too large an area of very light tone that your brain has to work too hard to figure out what's going on. It doesn't have to be much, just a subtle change of tone on the horizon in to the sky.