Use the panda's classic black patches around the eyes and ears as a canvas. Instead of filling them with black, use these areas to frame your most vibrant and colorful patterns.
To prevent the design from becoming visually overwhelming, select a limited palette of 3-4 complementary colors for the zentangle patterns. This will create a cohesive and elegant look.
For the smallest, most intricate details, use fine-tipped pens or sharply pointed colored pencils. This will help you stay within the lines and make the tiny patterns truly stand out.
Consider coloring the background in a single, soft, muted color like a light gray or a soft pastel. This will contrast beautifully with the detailed face and make your panda the undisputed star of the artwork.