I would suggest checking out Audiosocket. I thought your tracks were really good. One piece of advice – try making them a little easier for editors to use. You might want to try adding in breaks (between sections). Also, if the track has a very long intro, you might want to keep it an ambient track. If you have drums and bass that come in heavy after a while, then consider shortening your intro. Your tracks might get skipped over if the person auditioning them doesn’t wait around for the rock groove to kick in.
Lastly, it’s always good to have a definitive, resounding ending. Editors will edit back from this, so it’s arguably the most important part of any library track.