Draw a large oval shape for the outer heart
Add a slight indentation at the top center
Draw a pointed bottom tip
Sketch the right and left atria at the top
Sketch the right and left ventricles below the atria
Draw the septum dividing the left and right sides
Add the superior vena cava entering the right atrium
Add the inferior vena cava entering the right atrium
Add the pulmonary artery leaving the right ventricle
Add the pulmonary veins entering the left atrium
Add the aorta leaving the left ventricle
Draw the tricuspid valve between the right atrium and right ventricle
Draw the mitral valve between the left atrium and left ventricle
Draw the pulmonary valve at the exit of the right ventricle
Draw the aortic valve at the exit of the left ventricle
Label each chamber and major blood vessel
Trace the final lines with a dark pen or marker
Erase any extra sketch lines
Color-code the diagram if needed