Passing as a female when you are a male to female trans person can be a challenge. Your mannerisms, such as body language, posture, walking, communication, as well as your appearance, such as how you dress, hair, makeup, are all important when trying to pass. But, be and express yourself however you wish and are comfortable with.
4:18 - Female Mannerisms
8:13 - Female Appearance
Female Voice - https://www.youtube.com/watch?v=DQy7-NMqR-M