Chapter 6: Talons and Tea Leaves
There is no way around it: for the most part, Trelawney is an extremely disturbing and unsettling person to be around. There is a palpable sense of discomfort that she brings to the series to the point that you don't even need to see Harry's expression to know exactly how he feels in the presence of this unnerving woman in an overstimulating and cramped environment. The big glasses that magnify the size of her wide and borderline crazed eyes, the wild and frizzy hair, the posture that is often referenced in the books, and the classic fortuneteller-style classroom. You can tell just how hypnotic such an overwhelming person and atmosphere can be based on the looks of the girls behind her and the looks of trepidation on their faces. And the thing that really makes this piece stand out is the angle of Trelawney's eyes being directed straight at the viewer, adding a sense of paranormality to the piece to make it feel legitimately alive in the most disturbing sense possible, as if she's looking straight at you.
Personally I have always empathized with Harry's dislike of this woman as I found her to be eccentric, borderline arrogant, and obsessive in the worst ways such as her morbid curiosity and fascination with Harry's life and death.