Final answer:
August's first impression of Mrs. Garcia is that she appeared thin and colorless, with a mask and lack of character. However, her wonderful eyes were noticed later on.
Step-by-step explanation:
The first impression of Mrs. Garcia is described as someone who appears thin and colorless. The narrator notes that Mrs. Garcia wore a mask and had a lack of character or personality. However, the narrator also mentions that Mrs. Garcia had wonderful eyes which were only noticed later on. Overall, the first impression of Mrs. Garcia is one of ambiguity and intrigue.