Start with creating a new drawing. On start screen press draw and select draw on blank.
Decide the image size in pixels. For our drawing it is 768x1024px.
Now fill the canvas with black color. Open layers panel and press on paint bucket icon.
Choose the brush with the following settings.
Start sketching the main elements.
For flexibility, place the different elements of the drawing onseparate layers.
Add the details gradually.
Refine the background and thicken the strokes on foreground objects.
If you are happy with your drawing, do not forget to save it.