Highs at the beginning a little strong, as a heads up. May want to cut some of that.
You also may want to edit that piano a little, cause it's incredibly obvious that it's the unedited stock piano sample. Same with the guitar at around 1:20 and the violin around 4:30 (that part could use a pad in the background cause it sounds pretty empty)
Also this is 100% mislabeled. This is NOT dubstep whatsoever. Techno/Dance is way more fitting. Only dubstep element it has is the half time drums.
But the melody is pretty good, this could work as background or something. Where the bouncing bass part kicks in, that's pretty cool.
Side note- don't make songs 7 minutes long unless they're explicitly ambient. That's not something people are gonna listen through on.