A very pretty English girl who tends to wear little or no makeup, has pale rosy cheeks, natural hair and is well-spoken and ladylike.

Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.

an english rose is a young typically english girl.
normally, she will have brown hair, pale skin, green eyes and rosy cheeks. she is very beautiful and very rare.

Deflowering an English Rose or maiden during menstruation