First thought: I've never understood the idea behind F5-F8 being a different colour.
Second thought: if the middle of the nav cluster and scroll lock are black why are the up/down arrows not?
Third though: num lock / and * are red but the number/symbol row isn't, and the dancing spaceman(?) (top right key) is the only black in the column. It's common, but again I don't understand why as it looks strange to me.
Overall though I really like the red and black combo, and it's hard to criticise a board with penguin keys