Hello!
Sucks to hear that your VA teacher isn't giving great feedback
VA has always been my favourite subject when I did the HSC and it sucks when I hear other students not having the same great experience that I had.
Doing 3 major works does sound crazy to do in Year 12. I know our major work queen Angelina (angewina_naguen on the forums) did four so might be worth having a chat to her if you're still deciding about doing three majors.
Admittedly, VA did take out a huge chunk of my time during the terms and during the holidays as well. I enjoyed both prac and theory and I'm grateful that I had two great teachers and an amazing class to support me on the journey. However, I understand that the impending doom of doing the BOW can stress you out. Though, I believe that the BOW journey is so well worth it (I'll acknowledge the fact that I'm very biased towards the subject) Doing my BOW was a great break from doing my other HSC studying (the fact that you're making an artwork rather than writing an essay is pretty rad imo) VA is a crazy subjective subject so I understand the feeling you get when your art teacher doesn't like your idea. But again, the journey to get from point A to B is so rewarding.
At this point, it really is about- how can you manage your time if you decide to go ahead with continuing the subject. But I'll also recommend considering what you want to do for your tertiary studies (if you plan on going to uni) and your career goals. Will VA help you get closer to your goals? Rank the importance of the subjects that involves a major work.
We've got the VA resources thread here
https://atarnotes.com/forum/index.php?topic=173255.0 You might be able to find some useful things to read and stuff to consider before going ahead with your decision.
Hope that helps