Really good in potential
I recognise that you have a similar desire to me of trying to make the instruments sound realistic. I'm not familiar with the software you used so I don't know if you can add reverb. Reverb always makes instruments sound more realistic.
I use Reason and Cubase together, though Reason on its own would be really good for this. You can get it with an educational discount for around £150 I think...I'm lucky enough to be able to use it through college.
If you want to hear what Reason can do, listen to my track "Smile", for Cubase listen to "Wash Up"
But this is quite brilliant for the constraints you have! If you think the software package you have can add effects such as reverb feel free to message me because I spent AGES trying to make artificial instruments sound as real as possible.
Cheers
James