Trying to find ways to improve my drawing skills, I have started some fast sketching of myself in the mirror. These are only 5 of the 20 sketches I did in this batch.
The first four were done by carefully (within the time limit) tracing the outline, then filling in the features as fast as I could. In the last version I already had found a quicker way to sketch the outline, namely by not looking at the paper (blind drawing).
The trick of blind drawing seems to be that your keep your focus on both your subject and the imaginary position of the pencil on the paper.
That is all.