Memoji on iOS 13 is improved because there are more style options for users to customize their personal photos to resemble the most real ones (press the nose, earrings, braces, hair, wear AirPods, .. .)
Here are some pictures I used to try the new Memoji:
Now you will be comfortable setting up from skin color, eyes, hair style, nose-pressing style, earrings, … how to be like yourself
Note: Memoji is only available with iPhone X / XR / Xs / iPad Pro 2018 (with True Depth camera).