they are two Sprites high
I was out when I replied-- They are two high for the most part, and for the Bonnies I did an extra sprite on top for the ears alone. They look much bigger than the player. It was a pain in the butt to do it over and over for every iteration of each room map, but it was well worth it!
Good luck with your game! I will definitely be doing more in the future-- just a very busy time right now.