This means that when you draw, you should not just focus on one place, but take care of the whole. For example, if you draw a sketch of a character, you must first shape the outline and then paint the parts. When you draw the head, you should also look at the character as a whole from time to time. If you only focus on the head, it will easily cause the head to be inconsistent with the character as a whole. Problems such as the head being too big or too small will easily occur. If you draw the head while comparing it with the character as a whole, the result will look good and harmonious.

I hope my answer can help you.