There are two questions, which I ask me continuously while practising (and even while playing):1. What changes could I make to get the piece sounding better than it sounded the day before?2. What would the composer say, if he could hear me playing his piece?
1. What changes could I make to get the piece sounding better than it sounded the day before?2. What would the composer say, if he could hear me playing his piece?
1. First of all, use your ears. They will know when something sounds unclean or unstable, so that will give you a cue that you need to work on that particular section. You could also have someone else hear you and hear their comments. Ultimately it will be determined by the teacher.
2. That is a vague question because there could be different answers for everybody. This is a creative process so don't restrict yourself to one method of interpretation.
There is always infinitely many ways to interpret it thus.