Lolita fashion is a subculture that began in Japan that is primarily influenced by Victorian children’s clothing as well as fashion from the Rococo period.
Sweet Lolita fashion places its focus on the child-like aspects of Lolita design. It uses colorful prints, lace, and ribbons to emphasize the cuteness in the design.
Go for frilly and sweet. You can still wear dark colors, but it should definitely be toned down. Popular colors are mostly pastels: pink, sax blue, white/cream, pale yellow, mint green, & lavender.