I have often wondered about this also, Rosemaryh. I tend to think that the cards often tell what physical impression we get of someone or that someone gets of us rather than physical features. I'm not sure if I'm conveying my thought clearly or correctly. For example, I've pulled cards such as, the Sun reversed which i took to mean the person coming into my life might be black, asian, middle-eastern. Other cards i've drawn on physical appearance have been, five pentacles which might mean a person is frail looking or does not look healthy. High Priestess which might mean the person has a mysterious, exotic look about them. Nine Cups, someone who might be overweight or have a very jovial look about them. Empress, a motherly or ample woman. So, although the cards might not always describe specific physical characteristics, they often describe the physical "impression" we get of that person.
If I describe someone as having a very respectable look or business-like , or if a person has a very trashy look or they look like an outgoing person, what physical appearance would you imagine for them?
Many times a person's personality doesn't fit their look. For instance, I attended a meeting some years ago and while in a conference room full of people I'd never met, I noticed a very beautiful woman, very refined looking, very elegant looking. Later in the evening I met her and was shocked to discover she was completely opposite of what her physical appearance had spoken to me earlier.
Anyhow, I hope all this rambling made some sense