Alr well you still need to talk to the teacher, just be kind and respectful about it. You want to pass so you need to actually fight for your grade. If you have multiple projects that she hasn't graded then she needs to get her poop in a group and get to work. Also the school seems to somewhat be at fault if they are making one teacher do both of the art related classes because that is a lot of projects. So you could talk to an administrator about that because if your failing because she hasn't graded your work, there are probably other students who are failing because of the same thing.