I always pictured him with his paternal grandfather's hazel eyes

How could he have Hermione's eyes? They're not related by blood, only marriage.

Its a shade of brown she has since James has brown eyes but what shade

Ginny has bright brown eyes, Hermione has chocolate brown eyes and Andromeda has regular brown eyes (I hope its allow to think Andromeda would fill in for Lily so James Sirius, Albus and Lily would call her grandma remember Teddy calls Harry, Uncle)

So you meant eyes like his family members. I thought you meant he inheritaned the eyes from family. Whatever