Nice how you took the "black leather and spikes/spurs" basis of Katakuri's look and extended it into the hairstyle and top. The mouth is still obscured by the scarf, which is synonymous with the canon character, but I do wish we could see the scars surrounding the mouth. Also, this may seem a bit weird, but the eyes and skirt doesn't seem stoic and indifferent enough to me. Pants/shorts indicate a more masculine/grounded way of thinking, at least in my visual experience, but in the end, it's your picture and your design choices.