Seel is a cute and playful Pokemon with a blue body and a white belly. It has a round head with black eyes and a white oval on its forehead. Its black triangular nose gives it a mischievous appearance, and its small white mouth looks almost like a smile! Seel also has two small, blue fins on its back and a long, white tail. To color Seel, you could use light blues and purples for the body, and a bright white for the belly. The eyes and oval on the forehead can be painted in deep black for contrast, and the tail should be white and glossy. The fins can be a deeper blue than the body and outlined with a darker blue to make them stand out. Finally, don't forget to add in the subtle details such as the curved mouth to bring this charming creature to life.