As a bi woman, I'd recommend the Outlander sex scenes between Jamie and Claire as an example of hetero sex scenes from the female gaze. ;)

As for Portrait of a Lady on Fire (I haven't seen Blue) - I enjoyed it, although the most moving scene for me came at the very end where the camera lingers on the character's face while she's listening to an orchestra play "their song", and the whole journey of emotions in her facial expressions made me cry.