On the pictures, yours seem to be recessed but that may be perspective.

as for the color, mine were the same, I'm not expert enough on modern engines (give me an old aircooled and its an other story) but brown usually is good.

Knowing if you're running lean or rich need looking at the fuel trims with an OBDII since the ECU will adapt the mixture to run correctly.

Do you have an issue you're trying to pinpoint or are you worrying because of mileage?