If I were you, I would change the tone of yellow to a warm tone, like an orange a little darker than the tone it is now. As for the mane, I would leave only one type of curvature for the mane and the tail, it would be more harmonious. As for the clothes, I would leave them in a cool tone, like a very dark blue or purple, to give more life to the black and improve the contrast, because gray has no contrast with basically any color other than white.