The royal family's photographer reveals his favorite photos of Kate Middleton

"As a royal photographer, my goal is to create some kind of a response in the viewer, be it they smile, they laugh — and sometimes there's a more poignant image," Jackson told Insider. "These are kind of rarer images, but, nevertheless, incredibly important."

Jackson took the photo as Middleton was leaving the cemetery, calling it "one of the standout, slightly different images that I've taken with the Duchess of Cambridge."

"It's actually a great lesson as well to keep watching until the end of the engagement, because this was a lovely moment as the duchess was walking away and glanced over her shoulder," he said.

"I just love the energy in this picture and the expression on her face," he said. "I think there was an element of trepidation before she went over the top. But as she abseiled down, she was clearly enjoying it. It's a great example of how she does get stuck in and makes great photographs. It's got real energy to it."

"The duchess is emerging in some very typical British weather — I think it started drizzling," he said. "So she's got her umbrella out, but it's slightly unusual, and I just love the expression on her face."

Jackson says some of the best royal photos happen when the weather is less than ideal.

"I always find that, when it's raining, and quite often when there's a torrential downfall, you often get the most unexpected and fun images," he said. "So it always pays to be on your guard when you can see a big gray cloud coming along."

"I was looking around, looking at what might make a picture and what might not, and this seemed like quite a complicated silhouette so I wasn't sure it was going to work," Jackson said. "But I love this particular moment, where the duchess is between the spokes of the clock, and she's glancing out to the left slightly. It's just a little bit more unusual. It stands out from the day-to-day royal engagements."

"Pakistan is one of my favorite countries I've ever been to for royal tours," Jackson said. "It's got incredible color, energy. Everyone I've met has been very friendly."

Jackson snapped this photo as William and Middleton were finishing their tour of the historic site.

"It was the last engagement of the day, and the light was stunning," he said. "I really enjoyed this moment as they were leaving the mosque."

Held at Alexandra Palace in London, the Earthshot Prize awards honor environmental problem-solvers with a total of $5 million for their sustainable solutions. National Geographic dubbed it "the most prestigious environmental award in history."

"It was a real buzz to be behind the scenes and capturing some of those special moments," Jackson said. "This is just one particular moment which I loved in the evening. Visually, I think it worked, and it was quite special to be doing that."

"It was obviously this incredible moment and really highlights what is so special about being a royal photographer — to have a front-row seat to these particular historic moments," he said. "And this was watched by over 2 billion people around the world, the moment as the Duke and Duchess of Cambridge emerged onto the steps of Westminster Abbey on their wedding day, and stepped into the light, I suppose, symbolic of embarking on a future together."