Generate a portrait of an elderly man with a long beard, wearing a red, highly patterned jacket, a gold medallion necklace, and sunglasses. He sits against a backdrop of vibrant, abstract brushstrokes in blues, yellows, and purples. The lighting should be natural but soft, bringing focus to his eccentric outfit and sunglasses. The scene should have a hand-painted, oil-on-canvas look, with a heavy texture in both the subject's clothing and the background. Add HDR effects and color grading in Photoshop to make the image pop while keeping it artistic and regal.