Sentret has a very unique and interesting design. It is a round, dark brown Pokémon with a yellow stripe running down its back, two short ears with black insides, four short legs with yellow paw pads and a long and thin tail with a black tip. I would color this picture by making the yellow stripe stand out. A bright yellow color should be used for the stripe, to make it really pop. The black sections of the Pokémon should be painted a deep, sharp black, whereas the brown could be shaded a lighter, warmer brown. Additionally, the pads on the feet and the tip of the tail could be shaded a lighter and brighter yellow to really make them stand out. All in all, Sentret can be colored to be a truly vibrant and eye-catching creature.