This is a sketch I made of my son aged 4. The drawing was made using my left hand- I am right handed. Apart from the facial features, all the other lines were drawn continuously without lifting the pen.
Using your less dominant hand and drawing in a different style boosts your creativity. It also lets you look at the world differently. All the ‘mistakes’ in the drawing lend it a special touch and bring a portrait to life, as seen by another side of your brain.