Fine.
Why it was dull: You used pretty much the same 3 or 4 chords, all in relation to each other: I V, IV and V/II (submediant). The melodies in the Violin were quite nice, though, but your piano accompaniment ruined it. These chords were also why it was cliche, and the trills seemed out of place.
Your piece was not structured. It was Theme, some weird thing you call a 2nd theme, and then repeating it a few times (whether in different ways or not). What this piece is really lacking is development. Some more dialogue between the piano and violin would be nice rather than pure Solo + Accompaniment.
Why the piano didn't quite work: The idea of piano as accompaniment is an unoriginal idea, albeit a common one. This could make for a farily good piece if done properly, but you didn't use the piano...i want to say correctly, although we all know there is no right or wrong in music. You had most of the time chords in eighths...yay. Even this could work if you put some staccati on them and put something interesting in the bass, but the way you orchestrated it made it sound monotonous and choppy. The overall idea you've created is fine, but maybe it was one of those "good in theory, not on paper." Or as I like to call it "Good on the page, not on the stage." We all have those.
Although from what other music I've heard of yours this is probably the best. So you're getting much better.
...
How's that?
