。
She's photogenic.
Literal
She [topic-は] photo-appearance [subject-が] good.
写真写り (しゃしんうつり) is a useful compound meaning 'how one looks in photos' — 写真 (photo) + 写り (how something comes out/looks). がいい means it's good: she looks good in photographs. This is a common everyday expression in Japanese — not everyone who is attractive in person necessarily photographs well, and vice versa.