I think you'll need to get a little better at mixing and humanization, judging by this track.

Listen to a real piano record, and the dynamics are well, dynamic. This piece itself sounds a little flat, the left hand especially. It kind of sounds like you used the base piano library in FLstudio, which in itself isn't bad, but you need to mess around with FL9's filter effects to evoke a more realistic sound - I like using a bit of Fruity Reverb, and Stereo Enhancer.

Like I mentioned, dynamics are important - they liven things up and add a bit of variety. This piece has everything just kind of plink out in mezzo-forte, which gets a little tired after awhile. I've made the same mistake when I started using FL Studio close to 3 years ago - you find that playing a piece is not the same as sequencing!

As well, the song never really takes a break - it's always rushing forward, not allowing you to think about what's going on because the left hand is always grabbing your attention with its constant movement. If that is what you were going for, that's fine I guess, but you need to be careful with compositional techniques like that lest they bore your listener.

If you keep on trying, you'll only improve (I'm still improving!), so don't take this too harshly- the better you get at the program you use, the better your music sounds. Good luck.