Three things that you can do in order to make this piece much more "better" as you so calmly put.

1. Your loop is a bit long, but its smooth and fits pretty well.
2. Drums ~ They sound just fine, but consider adding a bit more through out the piece. Sections are nice, but if this is meant to be a drummers melody fitting for a cut-scene in a video game, I would add a little bit more of 'background' drums til your mains kick in.
3. IF you can (and would want to) add a faint mantra in the background to give it even more ambiance.

If these suggestions won't make this piece anymore sexier, I don't know what will!

I await your finished project :D