Today I painted a still life, using 5 colours in acrylagouache. If this had been a watercolour painting it would have ended up in the bin, as I made some mistakes along the way that I couldn't have corrected in watercolour.
The stages of painting. You can see where I've had to correct some mistakes, and paint over parts of the background. I used Scarlet, Deep Yellow, Ultramarine, Burnt Sienna and Carbon Black. I realised at the end that these are all warm colours - perhaps the background would have been better in a cool colour.