Personally I'd drop Visual Arts because-
1) You achieved a lower mark
2) Visual Arts has a major work which tests your creativity and takes A LOT of time
3) I think Japanese Continuers scales a little bit higher than Visual Arts
4) Probably a bit biased but learning another language has its advantages than say drawing or painting
But ask yourself this, which one sounds worse, drawing/painting/practicality OR speaking/writing/listening/reading? If you know which one sounds more stressful or bothersome, then drop that subject because while you don't like either subject, your performance in Year 12 will correlate with your interest. Hopefully some others will comment and help you decide what to drop, good luck!