Hi, Junyang,
You have a great design, artwork, and graphics that will catch people’s attention. Poster design is indispensable in multimedia learning, and we can better convey information to people in this way. The reader can clearly understand the activity and theme in your poster. But I would suggest not adding many words to the sign, which is probably a good point of improvement. Canva is a great platform to provide a different kind of creative experience. Do you have any other creative experience? Or do you have any other promotional poster experience?