Looks very much like the early days of colour photography.That reminds me of my mum's first colour photo's. Some had bits of colour and some still black and white.
Well done. Preferences I'd leave it as is. It looks realistic.
To do the crowd its going to be complicated as they will all be wearing different clothing colours. Maybe a generalised wash effect of several colours where some overlap the other to get highlights of different colours?
Snigger look at the long shorts.