Russell is a happy and energetic boy. His sweet face is lit up with a bright smile, and his short, dark hair is an integral part of his cute look. He is wearing a comfortable red t-shirt and jeans that are just a bit too long, noting that he is growing up faster than he would like.
For this coloring page, I would suggest using a wide range of warm colors, like bursting yellows and oranges, to further emphasize the joy radiating from Russell's face. You could also choose vibrant blues to bring out the color of his jeans. And don't forget to add some subtle tones and shadows to give his features more dimension.