Preview can photoshop images too, with a bit of effort. Wish it had a smudge/blur tool though.
• https://imgur.com/D1G9h63 Removed people on either side of the arch.
• https://imgur.com/iZazOgA Removed people above the person's head.
• https://imgur.com/taMCXpC Removed graffiti from below the carving's hand.
P.S. Get with the times HN; even Google Docs supports Markdown now.