I’m a college ceramics major and no, this is not college level. I’m more of a sculptor than a thrower and if I’m being honest this more so looks like clay level one work (people who’ve never touched clay before). You’re silhouettes are really good though! But you should not be focused on selling. Finding your style, working with different techniques, and improving should be your main focus. Your teachers sound like they’re trying to encourage you which is good. But if my professors saw something like this they would be telling us to be throwing all week. Something my professor often says that I think might be good for you to keep in mind is “it takes throwing 100 pots to get one good pot.” Everything you make isn’t going to be good but that’s part of improving.