Plugs #1 and #2 are what they should ideally all look like; white-tan. But the others do not look horrible in the photo, maybe just running a little bit more rich than ideal. In a long block like an in-line six with a single carburetor, it is nearly impossible to get the same mixture (air/fuel density) to all six cylinders. Too much variation in temperature for one thing.
If you're not burning oil and the plugs are not otherwise fouling, I would not worry about those.
