The Queen has unveiled a new portrait, painted by acclaimed Northern Irish artist Colin Davidson, who praised her for helping Anglo-Irish relations.
The painting, revealed at a reception in Crosby Hall, Chelsea, was commissioned by Co-Operation Ireland, of which the monarch is a joint patron.
Since 1979 the charity has worked to foster ties between Northern Ireland communities and people on both sides of the Irish border.
The Queen attended with the Duke of Edinburgh, while the guest list for the event included Northern Ireland First Minister Arlene Foster and Deputy First Minister Martin McGuinness.
Belfast born-artist Davidson has painted many significant public figures, including actors Liam Neeson and Brad Pitt, German chancellor Angela Merkel and Nobel Laureate poet Seamus Heaney.
Working with a large 4ft by 5ft canvas, he depicted the Queen wearing a turquoise Karl Ludwig day dress.
He said after the unveiling: "I jested with her she was still talking to me which was good, and she absolutely agreed she still was talking to me - so I took quite a bit of heart from that."
Davidson, who had one 90 minute sitting with the monarch in May, added: "I feel relief and a great deal of privilege I have to say as well.
"I realise the gravity of the event, I realise the symbolism of the event as well from an Anglo-Irish point of view, more than anything else.
"And what I hope is my painting in some way acknowledges the actions she has taken to advance healing in the Anglo-Irish relationship."
The Queen made a historic state visit to Ireland in 2011 when her presence on Irish soil - the first by a British monarch since Ireland gained independence from Britain - heralded a new chapter in Anglo-Irish relations.
The following year another watershed moment came when the Queen and Sinn Fein's Martin McGuinness shook hands at a cultural event in Belfast's Lyric Theatre, where Mr Davidson's paintings were on display.
