Spread the droplets around more so it looks less square (looked especially bad with piano). Slow down large splashes a bit for dramatic purposes, also taking low-g into account. Small splashes you can't really tell anyway.

#include <QtGui/QApplication>
#include "mainwindow.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
    return a.exec();
}