Final answer:
The image that best supports the analysis of the speaker's feelings about the state of his mind in Sonnet 27 is looking on darkness which the blind do see.
Step-by-step explanation:
The image that best supports the analysis of the speaker's feelings about the state of his mind in Sonnet 27 is C) looking on darkness which the blind do see. This line suggests that the speaker finds comfort in the restlessness of his mind, as he is able to perceive and understand things that others cannot. The image of looking on darkness, something that the blind can see, represents the speaker's unique perspective and his ability to find solace in his thoughts.