All the hidden details you missed in King Charles' first official portrait since his coronation

Charles is depicted holding a sword and wearing the ruby-red signature uniform of the Welsh Guards, a regiment of the British army that he was named Regimental Colonel of in 1975.

The king has worn the uniform during the annual Trooping the Colour ceremony, which honors the monarch's birthday at the Horse Guards Parade in London.

The use of red in the uniform and the rest of the painting is a nod to Charles' "royal heritage," as the color often appears in many historical royal paintings, according to Yeo's website, where he offered further insights into his artistic choices.

Yeo also explained on his website that Charles' red uniform purposefully blends into the swirls of red paint that cover most of the canvas.

He chose to fade the uniform out and keep Charles' face more pronounced to allow viewers to feel a sense of connection with the king as a person rather than have their attention diverted by his regalia.

"As a portrait artist, you get this unique opportunity to spend time with and get to know a subject, so I wanted to minimise the visual distractions and allow people to connect with the human being underneath," Yeo said.

In the portrait, a small butterfly flutters above Charles' right shoulder.

Yeo said on this website that the butterfly is symbolic for several reasons.

For one, it is a monarch butterfly, identifiable for its orange, black, and white colors.

As Yeo explained on his website, it's commonly believed that the monarch butterfly got its name from King William III, who was born in the Netherlands and known as the Prince of Orange until he ascended the throne in England.

Charles has championed sustainability and environmental protections for decades, long before he was imploring governments and businesses to take more action to combat the climate crisis at events like the G-7 summit and COP26.

In 1970, for example, he gave a highly progressive speech for the time about the consequences of pollution on the environment, which he said in an interview with ITV News in 2020 made many people think he was "dotty."

The butterfly pays tribute to Charles' passion for the environment, Yeo said on his website.

"Primarily a symbol of the beauty and precariousness of nature, it highlights the environmental causes the King has championed most of his life and certainly long before they became a mainstream conversation," Yeo wrote.

Just as a caterpillar builds a cocoon and transforms into a butterfly, Charles went through a transitional period of his own while Yeo was working on this painting.

Charles was known as the Prince of Wales when Yeo started on the portrait. By the time it was complete, he was king.

"In the context of art history, a butterfly is often the symbol of metamorphosis and rebirth, and thus also parallels the King's transition from prince to monarch during the period the portrait was created," Yeo wrote on his website.