Why should you fill in the general shapes of your design before adding details?

You should fill in the general shapes of your designs first because its going to be easier to add the details and you can also get confusing for you if you add the details first
i answered as best as i can but im bad at explaining sorry

The answer is a : varying the size of objects or subjects, so that some are smaller than others and the illusion of depth is created.hope this : )