Constructing a proper foundation as a way to get a drawing right. The cons of sight size method are with set up and mobility. It is difficult to learn at first but very empowering when developing your "artistic eye" I prefer to use a comparative drawing system of measurement so that you can refer to any items at any distance and get a proper relationship and placement. Taking one solid measurement and comparing it with all the items in relationships between the objects. Then constructing a proportional plan and using negative spaces to help figure out how to draw a 3d set up on a 2d surface.