Final answer:
Lady Macbeth is portrayed as evil through her invocation of dark spirits to strip her of compassion, her manipulation of Macbeth, and her desire to conceal their crimes with blood.
Step-by-step explanation:
The imagery that makes Lady Macbeth seem evil in the scene revolves around her manipulation, lack of remorse, and invoking of dark spirits. Her desire to 'unsex me here' and her call for the spirits to 'make thick my blood' indicates a rejection of her femininity and an embrace of cruelty. Additionally, instructing Macbeth to 'smear The sleepy grooms with blood' shows her active role in the deception. The dark, violent imagery of blood and night creates an atmosphere that reflects Lady Macbeth's malicious intentions.