The first step in this process is to paint the original image keeping in mind that each colour needs to be separated individually by hand. The more colours used in the painting- The more separations that need to be painted.
These originals were painted on the same board and were printed simultaneously so that the prints could share some of the same colours. Note the painted colour swatches on the top of each painting. These are done so you have a good block of colour to compare the inks to as each colour is printed.