The MTA Blue is a nice add on, but I think it should be old school and have that blue as a stripe that goes down the entire 85' length of the car like the M1 since the car numbers will be the same as them along with the M3's (9001-9946, 9891-9892 were the Ferguson Cars unfortunately). The front though should still have yellow on it to give it some fluorescence, and I would make it just like the M7's by putting a horizontal stripe across the lower headlights.
This is the train to (NYC). Stopping at: Babylon, Lindenhurst, Copiague, Amityville, Massapequa Park, Massapequa, Seaford, Wantagh, Bellmore, Merrick, Freeport, Baldwin, Rockville Centre, Lynbrook, Valley Stream, Jamaica, Kew Gardens, Forest Hills, Woodside, Penn Station OR Grand Central.