First i lay in the mid tonnes as its the value that will dominate the majority of the figure. Then i lay the light then the darks. Value is relative so you wont get your final values immediately. There will be a back and forth putting in lighter lights and darker darks. But if you plan ahead with 3 tonnes at the start.... the rest is easy. Next time i will clip a video or do a step by step of my process. Thanks for reading.