When the royal family visited Sandringham in December last year, as per their annual Christmas tradition, a throng of professional photographers was waiting for them, all vying to capture the most coveted shot of the day.
While there may have been stiff competition to reach the front of the crowds to catch a glimpse of the royals leaving St. Mary Magdalene Church, one woman managed to take a photo that was so unique it has earned her around £40,000 in the past year alone.
Taking the photo of the royal four has been "like a lottery win", Karen Anvil tells the BBC.
"The biggest change for me was that it was so nice to go shopping at Tesco and not be worried about whether I've got the cash in the bank," she says.
The 40-year-old from Watlington, Norfolk, was working two jobs at the time so that she could support her daughter’s nursing education.
She and her daughter, Rachel, had been particularly keen to see the Duchess of Sussex at Sandringham, whose engagement to the Duke of Sussex had only been announced a month prior.
"We really wanted to see Meghan, so we made a morning of it. It really is as simple as that!" Anvil toldThe Independent last year.
At 10.55am on Christmas Day, Anvil captured the Duke and Duchess of Cambridge and the Duke and Duchess of Sussex walking alongside one another, smiling cheerfully at the crowds as they passed them by.
Her photo sparked such an incredible reaction on social media that many advised her to acquire an agent quickly.
Since last year, the iconic photo has been sold to at least 50 countries and featured in a variety of publications and on TV channels all around the world.
Anvil's photography prowess has rewarded her with a regular monthly income, which can range from £600 to £6,000.
It's also led to a variety of incredible experiences, including the opportunity to become BBC Radio 5 Live's unofficial wedding photographer at the Duke and Duchess of Sussex's royal wedding in May 2018.
"The atmosphere here is absolutely amazing!" Anvil tweeted while in Windsor on the day of the nuptials.
Anvil had the chance to meet Prince Harry after appearing on an episode of BBC's The One Show, where she and a professional photographer competed to take the best photo of the Duke.
"I asked him if he had seen my Christmas photo and, after looking at my quizzically, he suddenly smiled and said: 'I hope you've been paid a lot of money for it,'" she tells the BBC.
In May 2018, Anvil bequeathed all of the money that she's earned from the photo to her teenage daughter Rachel.
In January 2019 the 18-year-old will begin her nursing training at Addenbrookes Hospital in Cambridge.
"Mum knew this was a one-off and wanted to use every penny wisely," says Rachel.
"Every penny the photo has made has gone on our family and our home. Even the guinea pigs. I'm so proud of her."
