I know many may disagree, but I think these coloured famous photos are much more powerful than the black and white originals. The perfect colouring takes away all the stylisation of the black and white and pushes the violence right into your eyes.
Unlike those old coloured classic movies coloured by Turner, which were horrible, these are perfectly executed. Digitally modified by Swedish artist Sanna Dullaway, the realism of the colour is truly outstanding. She made them to show her skills and sell her restoration and colorisation services on the web.
I like her non-violent examples too. The Kiss looks fresh and accurate, so do the portraits. There are a lot more examples on her pages. [Förr i Färg, DevianArt, Imgur via Petapixel]