The Boy - Digital Drawing

Here is my new digital art.
It's a scribble sketch of a boy with his small bag crossing his shoulder and resting at his back.

I started with creating simple lines. Then followed up by adding his facial features.
The next step was to start adding shades and forms using rigorous strokes.

The sketch was done with AutoDesk sketchbook application and aided with an S-pen. My steps can be seen below:

Thank you.