hyperrealistic mixed media high resolution painting of a Jack Russell Terrier riding a horse into the Civil War, stunning 3d render inspired art by István Sándorfi and Greg Rutkowski and Unreal Engine, perfect symmetry, dim volumetric lighting, 8k octane beautifully detailed render, post-processing, extremely hyper-detailed, intricate, epic composition, highly detailed attributes, highly detailed atmosphere, cinematic lighting, masterpiece, trending on artstation, very very detailed, masterpiece, stunning, flawless structure, lifelike texture, perfection,