As you are new to photography, it's probably not too late to mention that calm water and sea horizon always are horizontal and mirror images on calm water always are exactly vertically below the real thing. To me, even small deviations are obvious and make me loose interest.
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Every editor allows to rotate an image by degrees and fractions - and then to crop it. But don't do it in increments - always undo first and select a more likely amount until it's ok. Sharpen last.
A very handy tool is the freeware
Screen Ruler
. Just unzip the file, put it in a folder, make a link to the desktop and preferably the task bar and start it - no installation process, all Windows. SR can be moved with the mouse or the arrow keys, and swivelled to vertical to check on mirror images or items such as building edges or trees etc. You can have as many SR on screen as required - very useful for assessing cropping etc.
It's hard work, but very rewarding!

Apart from the running out sea, the sunset to me has some merits!