I drew the caricature representing me on Goodreads. It is how I looked about 20 years ago. I look pretty much the same today, just a lot grayer. I worked out a trick to drawing caricatures. I take a photograph and trace the lines of the face in black with a paint program. (This is similar to camera obscura that artists like Vermeer used.) It gives me a crude start to the image that has the facial characteristics in the right forms and relationships. (Getting the forms and relationships right is what makes a caricature look like the person.) Then I work on refining the lines and adding shading. The impression of the person can be lost in too much detail. A caricature is best, when the subject is represented by just enough.