My reply would be for a Maine Coon a square box muzzle is needed not going to a point, ear set no more that the width of one ear. Strong chin not receding, a scooped curve to the nose.
A medium neck lenght, long retangular body heavy boning and muscle toning. Tail should come up to the shoulders. Coat Shaggy medium at the back and top of the cat and long at the britches, tummy and tail. That is part of the standard of a Maine Coon cat. You can go to CFA.org and look up the other breeds. I am not sure of the standards for them.