See if your student can improve the score. For holistic applicants, they will get two reviews if applying early, and most likely decision will come between January and March so as long as scores received by December deadline, it will be used in second review.
In AIS, submit document and extended resume to prove your student’s Visualization experience. (ebook, Blender…) Portfolio is not required and admission won’t have the knowledge to review the quality of the products, the idea is to provide evidence of experience.