Facial stylization asks for a delicate transformation: the image should look unmistakably artistic, yet the person should remain unmistakably the same.
Existing training-free and instruction-driven methods often fail to expose such control, either drifting away from identity or producing only weak stylization.
We introduce Stylus, a training-free framework that treats facial style transfer as navigation on the curved latent manifold of a pretrained diffusion model.
Rather than interpolating in flat Euclidean space, \method refines the interpolated content--style point by lowering a ratio-weighted discrete geodesic energy under the pullback metric, made tractable by a rank-one power-iteration approximation of the Jacobian.
This principle drives two complementary controls: content--style latent interpolation for smooth semantic fusion, and self-attention query optimization for spatially adaptive style injection.
The resulting dual-control mechanism provides continuous, fine-grained control over stylization strength while preserving identity-critical facial structure, all without additional training.
Experiments show that Stylus achieves the strongest identity and content preservation at competitive stylization strength.