Sweet: Go for something soft pink. Quynh recommends: the brand's Lipclick Full Color Lipstick in Sweetie Pie or Baby Luv Glow Baby Glow in Honey or Girly Girl.
Sexy: Try an opaque red lipstick. Quynh recommends: Lipclick Full Color Lipstick in Cha Cha or a sheer red lipstick like Lipclick SPF 15 Color Shine in Glama.
Flirty/edgy: Try a glossy reddish pink. Quynh recommends: Gloss Gorgeous in Lolli.
Vampy: Go with a deep red. Quynh recommends: Lipclick Full Color Lipstick in Hot and Spicy or Totally Balmed Tinted Lip Balm in Totally Hip.
Source: Flickr User letmebeyourswearword