To me, space is what I think of as an anchor key - as with J and F and they should be matched. The two or three odd things to me are; numpad numbers different colour to row E numbers or alphas - I think I'd go for 0,1,2,3,4,6,7,8,9 red and 5 yellow, the salmon + and teal enter on the numberpad are just completely odd I'd put +-/*green enter, numlock yellow, . orange.
But that's just me... and I could be wrong...