looks like the combustion chambers show normal combustion patterns. as for the dimple in the one intake valve, two possibilities;
1: it came from the factory that way due to the head builders running out of valves, or pulling one from the wrong bin.
2: the head was rebuilt at some point in its life, and the rebuilder did the same thing; IE running out of valves or pulling one from the wrong bin.
either way its no big deal. as far as the reddish deposits, that is normal. it comes from the dye in gasoline.