Oshawott is a cute and endearing Sea Otter Pokemon that would look great in any color scheme! I would start by coloring its body in a soft, pale blue, and its underside in a snowy white. Its eyes and nose can be filled in with an onyx color, while its shell can be colored in a warm, grassy green. The tuft of fur on its tail can also be given a light tint of green, while its clawed forepaws can be a glossy, pale grey to add texture. Nature always provides inspiration and I'm sure you can come up with your own interpretation of how to color this delightful Pokemon!