You can color Dr. Julius Hibbert with warm colors like yellow, orange, and brown. The white coat can be shaded with earthy tones like beige, tan, and sand. The plants can be filled with bright greens, blues and purples, while the blue shirt can be shaded with a variety of blues and turquoises. You can also highlight his black hair by tracing some silver strokes and fill with a light gray. A pink or peach blush can be added to his cheeks and the stethoscope can be drawn with silvery gray. Finally, make sure to capture his smile with bright and warm colors like red, orange and yellow.