Wow, Eugene Latsko's trombone is impressive realism.
For your project, the basis is there, but the legato / portamento is too pronounced from my point of view.
It might also be necessary to put a bit of chaos in the vibrato (intensity and random frequency).
Adding a light sound of air flow will also help to make the whole credible.
Otherwise it's on the right track.
A video tutorial would be nice!![]()