Decluttering could sometimes bring you to good memories you had when you were younger. I am sure that you kept all these artworks because it has a special appeal for you. I am also a sentimental-type of person that's why I keep important stuff, especially if those things came from a special person that I love. By the way, all these artworks are really great and if you didn't mention it, I wouldn't know that these came from students! I was amazed by their painting capacities!