<p>In this talk, I would like to discuss the images of a Kerr black hole (BH) immersed in uniform magnetic fields, illuminated by the synchrotron radiation of charged particles in the jet. In this work, we particularly focus on the spontaneously vortical motions (SVMs) of charged particles in the je region and investigate the polarized images of electromagnetic radiations from the trajectories along SVMs. Our result suggests that the SVM radiations can act as the light source to illuminate the BH and form a photon ring structure.</p>