I could tell you a lot about this picture (it was part of my last year's "thesis") but since the question is brushstrokes-focused I can say Raffles has hit the right button.
The only straight, "balanced" strokes are the one representing the two men and the bridge. The landscape is made of wavy lines, and so is the central character (willingly deformed to be interpreted both as a man or as a woman, the intent being to represent any human being -no sex, no race, no age-). This lack of balance represents the loss of armony between the man and the world/nature, and generally an expression of universal pain. The sky is fiery and fearsome instead of calm and blue, the fjord a disquieting yellowish-bluish-blackish pond, almost a whirlwind ready to crush the nearby boats. The scream is a scream of horror and weakness and desperation, a scream so powerful yet mute, a subjective terror that doesn't affect the two people who keep walking quietly.
You should look for some more Screams as suggested by Raffles, 'cause a comparison can prove to be very useful - in previous versions you'll notice how the main character is more definite, in later ones how the colours become ever more vivid and strong. Also, use my interpretation as an inspiration more than just copy-pasting it, since I feel your teacher wants to know your feelings (which can be very different from these) and not the ones of some internet forum guy.
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