Alyssa Milano was at her most beautiful during Seasons 5-early Season 6
By early Season 6 (1989-90), I mean prior to the "Supermom Burnout" episode (which I want to say, was the eighth episode of the season), in which Alyssa started sporting a darker hairstyle that was cut the shoulders and had bangs.
Otherwise, this was when her hair was really long, thick, nicely coiffed into a side-part, and medium brown with a tinge of blonde. It was at this point, that she quite literally looked most like Ariel in Disney's The Little Mermaid.
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