King Charles, who turns 75 today, is said to be one of the most successful living artists in the UK.
His paintings were first exhibited in Windsor Castle in 1977.
The king favors outdoor scenes and only paints in watercolor.
King Charles is an avid artist — and many of his works have also fetched a pretty penny.
Like his great-great-great-grandmother Queen Victoria, the monarch prefers watercolors and paints scenes of natural beauty, like mountains and lakes.
Though he describes himself as an "enthusiastic amateur," he is an honorary member of the Royal Academy and the Royal Watercolour Society, and his paintings have sold for more than $2 million, the Telegraph reported in 2018.
Here are 13 of King Charles' paintings.
King Charles III has been painting for nearly 50 years after getting his start while at school in Scotland.
King Charles started painting in the 1970s after he was inspired by Robert Waddell, his art master at Gordonstoun School in Scotland. The school has a 200-acre woodland campus, and it is within walking distance of the beaches of the Moray Firth.
He works exclusively in watercolor, and his paintings were first exhibited in Windsor Castle in 1977. They were displayed alongside works from Queen Victoria, herself an avid watercolorist, and the Duke of Edinburgh, a painter and designer, whose sketches helped create the stained-glass windows in the Private Chapel of Windsor Castle.
Many of his earlier works, like this 1986 painting of Castle Mey, showed family homes. The castle used to be the home of the Queen Mother.
Castle Mey is located in Caithness, on the north coast of Scotland. It was the home of Queen Elizabeth II's mother, the Queen Mother, with whom King Charles was particularly close.
Many of his paintings were completed in Scotland, where he spent his youth and returns often.
He enjoys painting at a pond in Helmsdale, Scotland, where he also frequently fishes, according to The Telegraph.
One of his favorite places to paint is Balmoral Castle, pictured below.
The king, who has donated all profits from his artwork to The Prince of Wales's Charitable Fund, prefers to paint outdoor scenes, favoring mountains, streams, and the surrounding areas of the Queen's estate at Balmoral.
Balmoral Castle is located in Aberdeenshire, Scotland, and was occupied by Queen Elizabeth II until her death. The home was first purchased for Queen Victoria by Prince Albert in 1852.
Charles has painted numerous scenes around Balmoral, including these surrounding hills.
Queen Elizabeth spent her summer holidays at Balmoral, and it was believed to be her favorite residence.
"I think Granny is the most happy there. I think she really, really loves the Highlands," Princess Eugenie said in the documentary "Our Queen at Ninety."
He has said he prefers watercolors because they are quicker to finish so he does not have to keep his security detail waiting too long, The Telegraph reported.
He was taught by some of Britain's most famous artists, including John Napper, John Ward, Hugh Casson, Edward Seago, and Derek Hill, according to The Telegraph.
The king's paintings have been displayed in multiple exhibitions and at charity events.
Following his first exhibition, King Charles continued to show his work, which became hugely popular in the UK and abroad.
Though he modestly refers to himself as an "enthusiastic amateur," The Telegraph reported that he made an estimated £2 million from the sales of copies of his watercolors from 1997 to 2016, making him one of the country's best-selling living artists.
His work has been shown by the Royal Collection Trust. He also had a large exhibition at Buckingham Palace for his 70th birthday, The Standard reported.
"Lochnagar from the Gelder Cottage," pictured below, was displayed at the Royal Paintbox: Royal Artists Past and Present exhibition at Windsor Castle.
In 1980, he and Hugh Maxwell Casson published a children's book, "The Old Man of Lochnagar," which is about an old, cave-dwelling man who meets a Scoticus, a bubble-blowing god of the sea.
He showed many of his watercolors at a charity reception for International Nursing and Nurses Day.
In 2018, Charles praised "unsung" work by nurses and highlighted the work of those who treated victims of the Grenfell Fire, in which 71 people died when a residential building caught fire.
"I was [once] rushed to Great Ormond Street with a rapidly expanding appendix," the prince said. "I have never forgotten how wonderfully I was looked after by the nurses there."
King Charles has painted watercolors all over the world, like this one from 1989 of Double Haven Bay in Hong Kong.
In 1989, the former prince and his wife, Princess Diana, visited Hong Kong to open the Cultural Center, a $600 million complex on the waterfront at Tsim Sha Tsui.
The king has spent a great deal of time in Switzerland, where he often stays at Klosters ski resort. Klosters liked his work so much that one of his paintings was used on an annual ski pass in 1997.
In 2018, he celebrated 40 years of skiing at Klosters with a private party. In 1988, he narrowly escaped an avalanche there.
"I've never forgotten the sound of it. The whole mountain apparently exploding outwards ... vast clouds of snow. I thought to myself My God, the horror," the Daily Mail reported him saying.
His works have been featured on stamps in the UK.
In 1994, the Royal Mail honored the king by putting his watercolors on its stamps, including this painting of Arkle mountain in Sutherland, Scotland.
Arkle is located in the far northwest corner of the Scottish Highlands. Much of the mountain is made up of Cambrian quartzite, which gives it a glistening appearance when seen up close.
This British stamp shows his painting of Dersingham in Norfolk, England.
The royal family has a home in Dersingham where they often spend Christmas.
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