Sorry, more Learning curve.

Still way down the curve. There's a philosophy of "R.T.F.M". In my book it's slowly being replaced by "W.T.F.Yt." inasmuch as most of my Photoshoppery is learnt from Youtube rather than literature.
At the top - In its raw state. Not to be confused with shot in RAW.
At the bottom - what it became. It beats the hell out of trying to draw a wiggly-waggly line along the horizon as I have done a time or three. Apparently I drew "an S  curve". 
Still much room for improvement, but it's a start.