You definitely need an instrument with more attack for the lead. That string instrument that you used sounds like it would be more suited towards rhythm. The second lead instrument was better, but had a lot of vibrato built into its sustained sound.
When the song broke into full orchestra, that was AWESOME. Better strings and horns, but still a tad cheesey due to the fake sounding nature. But still, I love half of this song, when it broke into full sound, that was great. I liked the pleasant undertone of light percussion, good job there. Very Irish sounding and definitley belongs in the realm of folk music.
Overall: This song met the criteria of the contest and fits well in the folk music genre.