its empty because your not incorporating other instruments into the track.... there should be other instruments(not required) to support and sometimes go against the flow of the main melody...
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http://www.xkwest.com/xbeatm3us/crutches_xkwest.m3u

here's an example of an old beat i did months back.... basic combo of piano and strings.... notice how the strings flow at a slow pace with the piano... and also notice... how the flute is doing its own thing... it doesn't flow perfectly with the piano or the strings...
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the best way to learn is to experiment...
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throw a sax, xylophone, cello, violin, basoon, glockenspeil, or whatever into the mix... test to see if flows right... fuck with it...
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you just gotta paint the beat you want... unlike a painter unable to erase... you have the ability to put instruments through what i call an "audition"......


peace....

http://www.xkwest.com