What breed do you think my cat is?

You can tell that shes a main coon or maine coon mix by the characteristic "M" on her forehead , she also looks like a little Calico tabby mix :) Very pretty cat . Is she over 20 pounds ? We had a Maine coon that was 35 and he was found as a stray . I may also add we Shaved him down to look like a lion and it was the cutetes thing ever and he loved it ! We did it in the summer .