First, a femme (in English) is a queer feminine woman. Most women who identify as femme are interested in butch women or transgender (biologically female tending towards male identy) people. Femmes may or may not identify as lesbian, as the butch/femme dynamic aligns as easily with heterosexuality as it does with the non-butch/femme lesbian dynamic. Especially if the femme is only interested in male-identified butches, she may not consider herself a lesbian.
High femmes are femmes who intentionally and consistently embrace and express femininity past the point that most straight women do.
She's so high femme, she's sometimes mistaken for a drag queen.
A queer individual (usually in reference to the ladies) who revels in extreme expressions and/or parodies of femininity.
"You'll always see the high femme in the dress made for someone considerably smaller and younger." (Leslie Mah)
A lesbian who expresses the cultural norm for ultra-femininity - makeup, dresses, heels, hair, nails.