There are several factors that can cause a person's voice to sound different from how they look:
Anatomy: The physical structure of a person's vocal cords, throat, mouth, and resonating cavities plays a significant role in determining the quality and characteristics of their voice. Even individuals with similar physical appearances can have distinct vocal anatomy, leading to variations in their voices.
Vocal habits and training: How a person uses their voice and any training they have received can greatly influence its sound. People who have undergone vocal training or have developed specific vocal habits, such as actors, singers, or public speakers, can have voices that differ significantly from what may be expected based on their appearance.
Cultural and social influences: Cultural and social factors can also shape the way people speak and the unique qualities of their voices. Regional accents, speech patterns, and linguistic variations can lead to diverse vocal characteristics, even among individuals with similar appearances.
Psychological and emotional factors: Our emotions and psychological state can affect the way we use our voice. Stress, anxiety, excitement, or mood can influence vocal tone, pitch, and other qualities, causing a person's voice to sound different from their usual speaking voice.
Health conditions and vocal disorders: Certain health conditions or vocal disorders can alter the sound of a person's voice. For example, conditions like vocal nodules, polyps, or vocal cord paralysis can cause hoarseness, breathiness, or changes in vocal range.
It's important to note that while a person's voice may seem different from what we expect based on their appearance, it is an inherent part of their identity and should be respected. Voice variation adds to the richness and diversity of human communication.