Do you have a score for this? That's always nice. Also, why do you say flute OR violin? If you prefer flute, why not just say for piano and flute?
The first section of the piece is pretty and entertaining and the piano part sounds very nice but the measure by measure chord changes strike me as kitschy. I liked the melody in the violin a little bit, but it started to grow stale after awhile, a little more variation wouldn't hurt I think. In the second section, the arpeggios in the piano start out very nice but I think they remain simple and don't really expand and just keep revisiting the same patterns. The ending was really nice I thought and put a nice finish to the piece.
Nice