We have broken the art model, we want the label, artistic, but we forget the key underpinnings.
The selective deficit in generating human figure representations always derives from limited practice in drawing.
How to sketch ?
The world is full of unfinished drawings. Most of the fun of drawing from life is that you can exagerate. Don't be afraid to be imaginative. Your life model model also provides a handy set of "rules of thumb" for selecting specific whimsical images for various applications in the online (humorous) art site.