4 - sail base coloursAfter drafting out the background on the right, the other boats and creating the entire composition, I've blocked in the sail base colours of the main yacht.  After this I've worked on a small area of the background on the left, painted in Pendennis Castle and put down some base colour for the land below the castle.  When the main sail base colours are dry, I can then draft on all of the detail within the sails.