Indefinite Pronoun and Antecedent Agreement

As the sun set over the horizon, the sky transformed into a canvas of vibrant colors. Many people stopped to admire the breathtaking scenery, capturing photographs to share with their friends and family. This moment was a reminder of the beauty of nature and the transient experiences that life offers. However, the photographer, who had honed his skills over years, knew that if he didn’t adjust the settings on his camera, the photos wouldn’t convey the same richness and depth of color that he was witnessing in real-time.

Which of the following sentences contains an error in the use of the indefinite pronoun related to the subject?