Thank you Ish and cepe for your answers regarding the photographs.
I found it interesting as I'd never seen photos like that before. My mother and I were talking about this yesterday and she said that she had a few tinted photos of her from her childhood and also of her mother. She also said that the photographers noted down what colour to use, and didn't just tint them at random.
"For beautiful eyes, look for the good in others; for beautiful lips, speak only words of kindness; and for poise, walk with the knowledge that you are never alone". Audrey Hepburn