Demonstrating your character animation and rigging skills in motion design can be done effectively by showcasing your improvement in your portfolio. Your portfolio acts as a visual resume, helping you to attract clients, employers, and collaborators. To do this, choose the work that reflects your style, personality, and skills, and that matches the purpose and audience of your portfolio. Make sure the work shows your improvement over time and showcases your character animation and rigging skills in different contexts, genres, and formats. Additionally, organize the work into categories, themes, or projects with clear titles, descriptions, and credits for each work. Highlight the main features and challenges of your character animation and rigging skills to draw attention to your portfolio. Furthermore, keep it up-to-date with new work as you improve those skills. Remove outdated or irrelevant work, and edit or revise existing work when necessary. By doing all of this you will be able to enhance your character animation and rigging skills in motion design.