I work at H&M, and trust me, it doesn't matter if your application has been rejected. KEEP ON APPLYING. I sent the same application so many times until I finally got that phone call. They only select a few candidates for an interview at random so you're bound to get an interview at some point (unless your application is really crappy).
teepot23 - H&M doesn't take CVs by hand any more. Everything is done online now. At least, that's what we were told in the training. I suggest you go back to the store and ask to talk to a manager and let them know you handed in a CV. Make sure you write a nice cover letter too and mention your fashion blog. Show them that you have a passion for fashion and let them know why you would be an asset for the company. Sell yourself but don't over do it.