。
She has a cute round face.
Literal
She [topic-は] cute round-face [object-を] has-as-feature.
The descriptive ~をしている construction attributes a physical feature to someone — '[she] has the feature of [X].' 丸顔 ('round face') is one of several Japanese face-shape descriptors that classify physiognomy — alongside 卵型 (egg-shaped), 面長 (long-faced), 四角顔 (square-faced), and others. The vocabulary for face shape is unusually rich in Japanese, partly tied to face-reading traditions and to skincare/cosmetics culture, which often advises makeup techniques tailored to specific face shapes. The polite ~ています keeps the tone in everyday-polite descriptive register.