The figure in the center of the frame is taking a picture of the coloring page with a large camera. He or she is wearing all black, with a long coat, and their hair is covering their face. If I were to color this page, I would create a stark contrast between the figure dressed in black and the brightly colored scene around them. I would use a vibrant palette for the background, maybe with a hint of yellow running through it to signify the camera's flash. Then I would add some bold colors to the figure's clothing, like a bright red or deep green. This would create an interesting contrast and show the figure in stark relief. The figure could also be shaded for a bit of added texture and drama.