When you have a structure, that isn't characteristic, it's essential to add something that gives your rendering scale. People are one of the advisable things to bring to your composition. Not only do people add liveliness, they contribute scale. Be mindful! You can be slightly off with your scale, and you will through your viewer off.
A acceptable architectural figure is six feet tall, give or take a sensible variance for sex, age, or ethnic differences. The average body is proportioned to a height of eight head lengths. Legs are four head lengths, shoulder width is two lengths, and hip width one and half head lengths.
Children's heads are slightly larger in proportion to their bodies.
From proper proportions, the figure can be laid out as a series of simplified shapes. I apply my people in post-production so; I use boxes in my scene, to symbolize these proportions.