If you find this little walkthrough useful, I’d be grateful if you could add it to your favourites or leave a comment; just to let me know whether or not I should create another similar project in the future.
I don't know what's with the scanner, but the colours of the painting (especially those in the face), are closer to the original photo in real life and not quite so "harsh" as they appear here. I'll see if I can take a photo of the painting in daylight instead, later on.