I must always chuckle when it is asked how long did it take to do that. the real chuckle is a puzzling face for a brief moment, as it took my entire life to do that.
I keep my samples here free of any watermarks, registration marks, and any copyright stamps for viewing. If someone gets the idea they can steal anything I have an earlier file retrievable through Photoshop metadata, or original film analysis, or the original article, so just try it and see what happens. Enjoy viewing and have a great day.