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The reference to the "perfect form of the cottagers -- their grace, beauty, and delicate complexions" creates the following impression:
It presents the idea that physical perfection is a Romantic ideal.
It heightens the contrast between the creature's physical description and those of the De Lacy's.
It reinforces the creature's attraction for Agatha and later for Safie.
It furthers the idea that the De Lacy's are different from most of mankind.
It shows that the creature sees himself reflected in their form.