Create a mockup featuring a black oversized t-shirt for men. The mockup should consist of two split images: one displaying the front of the t-shirt and the other showing the back. Ensure that the frame only reveals the shirt without displaying the model's face. The mockup should provide a clear view of the shirt design without any distractions. Customize the t-shirt with your own designs, paying attention to placement, size, and alignment. The final mockup should be professional and visually appealing