I am trying to figure out who Vincent looks like. He definitely has his father's colouring. It is interesting that brown eyes are usually dominate over the recessive blue eyes yet none of the their children have Mary's brown eyes. Genetics is interesting.
To my understanding eye color isn't always according to the simple genetic rules (the laws of Mendel). There are more factors involved. And it is interesting to see what can come up. E.g. my mom has brown eyes, while her parents had brown and blue eyes. My dad has grey / greyblue eyes, while his parents had both grey / blue eyes (I am not certain about my grandfather, he died years before I was born). My siblings and I have all brown eyes, but with variation in intensity. And later on I got comments that my eye color isn't soley brown, that it also contains some green and/or greyish coloring. Often depending on the light and the way you look into my eyes which will prevail / be more visible.
Every person is unique, but still you can recognize specific traits / features that reminds you of his or her family members. As well as from direct family members as rather distinct ones.