Some tips:
- Avoid children playing your work. The internet is full of "prodigies". Most piano teachers think, "I could fix that".
- Is this piece being played by an adult in evening wear in a concert hall?
- Is this performance taking place in a piano studio of a recognised expert?
- Do they follow the score?
- Does the performer have a track record of achievement?
Good places to start.
Best,
David Story