According to DepEd No.21,s.2023 @mariasalve, then it is being stated that walls should be free from unnecessary artworks and more. For me, it's the teacher's discretion also na maam, like posting the DepEd's Vision, Mission, Core-Values , Lupang Hinirang, Panatang Makabayan, Panunumpa sa Watawat. So far these are the important things I consider in my walls. Hehehe