good start!
I've written a bunch of reviews today, and in many of them I have said what I'm about to say to you: be aware of frequency ranges. There are two ways to do this: as you're choosing what instruments to use, consider if they share a frequency range with your other instruments. The other way is to EQ most of the tracks so that they each have a frequency to themselves... it's okay for them to share frequencies, but if each has it's own "sweet spot" the clarity of each instrument will be increased dramatically. It sounds silly but it's really, really amazing how much a track will sparkle with a little EQ. Anyway, keep up the good work!