Create an artistic illustration art piece in a flat style, highlighting a stunning stained glass design of Santa with Rudolph in a Christmas theme. Emphasize the golden ratio for a perfect composition, using simplified bold lines for a masterpiece effect. Incorporate a matte black background to enhance the Christmas mood. The artwork focuses on an imaginative expression, avoiding realistic faces, 3D elements, side views, reality, and small detailing for a raw and personalized artistic touch.