This might not be the best possible advice for you since I'm really, REALLY drunk right now, but here's what I think from a quick, drunken listening:
The guitars sound a bit too thin. The sound itself lacks some balls. Also, you should check the panning on the guitar tracks. In the beginning, the rhythm track is on the left and the lead (I guess it's the lead, fuck, I didn't realise I was this wasted) is on the right. Try panning the rhythm tracks L/R and the leads close to the center.
Also I don't dig the snare sound. It comes too much through, kinda bites the ear. Try giving it a bit more body and sinking it more to the rest of the drums.
Sorry if I sound confusing, but as I said, I've got some alcohol running thru my veins right now. I'll give the mix a new listening tomorrow, but this is what it sounds like to me right now.
Other than that, I think you have a pretty good start to start tweaking from. Good stuff, mate!
