First layer (15% opacity): random scribbling or oval shapes. Second layer (100% opacity): sketching.

Have you ever sketched the shape of the head lightly, and then went over it more boldly? You were tracing, whether you realized it or not. Tracing in and of itself is neither bad nor good. Here’s an example of how tracing can be put to good use. This kind of tracing is highly recommended, but the kind where you trace to capture everything perfectly, with the intent/desire to improve your skill, then it’s not recommended.

In the examples above, the first two started off with scribbling. I didn’t have an idea for a pose and just wanted to see what randomness would give me. The last two examples, I knew the poses I wanted to draw, and used these ovals as rough guide. There are many ways to approach this. From random scribbling, to gestures, oval shapes, etc… The anatomy and foreshortening might be incorrect, but not bad for a 1-5 mins rough sketch done freehand.