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Slowly over the months, the character's shapes have been edging closer to the modern style.
All of the characters except Lucy have thick eye-dots, solid little ovals of black. Lucy instead has those wide circle-eyes, at least when we see her from the front. Here she's only seen from the side; when seen in profile, or when she's looking at something out of the corner of her eye, Schulz tends not to draw the complete circle, which makes her look a lot more like her modern look.
Thus in this strip, Lucy looks very much like she does in the years to follow.