"I see many female students wearing make-up" 1. 화장하는 여학생들을 많이 봐 (casual) / 화장하는 여학생들을 많이 봐요 (polite) 2. 화장하는 여학생들이 많이 보여 / 화장하는 여학생들이 많이 보여요. (Both are commonly used, natural expressions with the same meaning) * 화장하다: make up; wear make-up. * 여학생: female students. 학생, 남학생, 여학생, 대학생, 여대생 are common words to refer to school age youths.

Sorry, I don't know how to say "female students" specifically. But, I think whoever you say this to will assume you mean female students. 화장품 (메이컵)을 하는 학생을 많이 봐요. I don't know how to romanize hangul. Here is my best try... Hwajangpum uhl hanun hakseng uhl manhi bwayo.