I'm with your American friend. Your sentences are very unnatural, with or without an article.
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victorkMy preference is to omit the "a" in all the three examples.I'd omit it in the second and third, not in the first. No, I don't know exactly why.
victorkMy American friend told me, "just say 'she was very tall, etc.', it will be easier", but I like to understand how this works.Annoying, isn't it? The most idiomatic