Before frame shape, check fit: bridge, temple length, pantoscopic tilt and pupil height decide whether any frame flatters you.
Frame shape gets the advice; fit decides the result. A perfectly-chosen shape that slides down the nose photographs worse than a neutral shape that sits right.
Steps
Bridge: no red marks, no sliding. Asian-fit bridges (higher, flatter) exist precisely because the classic European bridge assumes a high nose bridge.
Temple length: the arm should follow the skull and only curve after clearing the ear. Long arms slide; short arms ache.
Pupil height: pupils should sit at or a hair above the frame's vertical centre — lower reads librarian-tired, higher reads sharp.
Frame width: the outer edge tracks the cheekbone line (this is the one place face shape enters the fitting).
Tilt: 8–12° pantoscopic tilt is the classic — it angles the lens to your natural gaze.
Reading the result
Fit failures show up in photos as frames sliding, brows hidden behind the top bar, or the frame cutting the cheek. Fix fit first, shape second.