I think the Mister Mime coloring page looks really cool! I would color it in shades of white, black and red to fill out the details and make the image more vibrant. I would draw a pale pink shade on the black cheeks to give it a cheeky, rosy look, and also a pinkish finish on the white spots. For the tail, I would add a light yellow or tan to make it appear more 3-dimensional. To make the image stand out, I would pick bolder colors like dark red and black for the face and hands, respectively. Lastly, I would outline the entire figure with a bright, dark blue on the edges to give it a stylish, polished look.