Water-soluble pencils tend to be softer than ordinary coloured pencils. Charcoal is a fast and responsive drawing media. It gives both soft and strong lines depending on how it is used.

A collage of hand-drawn portraits posted to social media on Monday depict Princess Kate as drawn by her three children.

And Kate's portrait, which appears to be drawn with pencil or charcoal, shows a restful George with his eyes closed. "Drawing portraits with children can provide a moment of connection as you ...

And Kate's portrait, which appears to be drawn with pencil or charcoal, shows a restful George with his eyes closed. "Drawing portraits with children can provide a moment of connection as you ...