Either you can pass this juice first then make your drawing on it when it’s dry. Make the drawing as before, using the method of your choice, then … Prepare the different colors composing your subject. They will be placed on the canvas, also as a “juice”, light, watercolor, diluted with turpentine. These colors will be close to the final colors. If you have to put on later, a dark red, for example carmine, put a diluted magenta. If you have an orange, put a vermilion red or medium cadmium yellow, diluted. They will help you visually to realize the chromatic balance of your painting. When all the canvas is covered with this colorful juice, take your canvas, and place yourself in front of a mirror (that’s why there is always a mirror or ice cream, in a paint shop!) You then observe if the colors are well placed, if the harmony you like, if the drawing is good! correct if necessary.