Some valley nails are inside the 6 inches, this could be an indicator of water leaks.
Click the link below to see the Advisory.
GAF Steep Slope Technical Advisory
Shingle nail patterns are terrible. They are too close to the union.
This is a major problem and will cause leaks in the roof. The nail pattern is not properly spaced over the entire roof.
Technical PDF From GAF On Improper Driven Nails
Proper nail patterns from GAD Pro Field Guide: