In 1985, Warhol turned his screen-printing talents to the queens of the world, from Queen Margrethe II of Denmark, to Queen Ntombi of Swaziland, and of course Queen Elizabeth II. What made these works particularly special was that all of these queens ruled in their own right, and were not queen through marriage. These queens represented female authority, a different view on femininity in comparison to Warhol's portraits of the likes of Marilyn Monroe and Billy Boy.

A step away from Warhol's young and 'diamond-dusted' Queen is Ralph Heimans' 2012 portrait of the Queen. The portrait, which was created to mark Elizabeth II's Diamond Jubilee, portrays the Queen as she is recognised today, older and stoical. She stands, perhaps reminiscing, in the exact place where she was crowned at Westminster Abbey, at just 25 years of age.

The Queen was moved deeply when the portrait was first revealed to her. Heimans stated in 2012: "It is clearly a moment of reflection coming back to the spot where the story began 60 years ago, from a bereaved young girl to an 85-year-old lady.”

To celebrate Queen Elizabeth II's 90th birthday, Barnebys have selected pieces which would surely get the Royal seal of approval. Click on the object to discover more.