The unusual scratches on the cylinder wall is probably from when the tool was withdrawn from the cylinder. A non issue.
The pit looking marks on the cylinder walls might be casting flaws, or a small rust pit, also likely a non issue.
The carbon is coming off the piston and exposing aluminum below, which is discolored a bit, looking yellow.
The pit on the piston is likely an index mark. Remember, when something is ingested, it bounces around creating a wonderful pattern of destruction. Not just one "ding".
Can't tell on those valves. That might simply be carbon buildup that's creating various patterns.
Borescopes provide notoriously misleading images. They often use an LED light which is NOT a high CRI source. (color rendition index) In the aviation world, inexpensive borescopes lead to massive problems, due to misinterpretations. I use a "mini-maglight" grain of wheat bulb soldered onto two small single strand copper wires (like old telephone wire) and attached to a battery pack with 2 AA batteries and a small switch. It provides a much better light source and a very clear understanding of what you are looking at.
I do find it odd that the carbon pattern is so uneven. Are you ingesting water?