Theres no right or wrong answer to this. It totally depends on the indivdual deer. As an across the board average though, I would say MOST deer start out as a dark to med. grey on the bottom of the nose pad and fades into darker shades of black, brown as you go up. Personally, Ive never seen an all grey or all black nose pad.
That said, I understand why the taxi made the comment about you not being around live deer. What he means is up close, at arms length for hours at a time. Looking closely at anatomy, hair patterns and skin colors. You need to realize that taxidermist are re-creating details in a mount as the animal was before it expired. They do so by using photo reference of live animals. Once an animal is dead, muscles relax, blood moves and skin color changes. Ive had several arguements with hunters over the color inside of ears. "THAT'S WRONG! ALL DEERS EARS ARE WHITE INSIDE" Yup, they are when their dead!