Sounds pretty good man! Just focus on mixing IN the genre. You will get mix approvals a lot faster if it sounds like metal (in this case).
If you spent a few hours studying some metal records you'd have a better clue of where to go on this one. When possible, try to get a feel for what genre the producer is going for and then go study some examples to get ideas. Then you can start "mixing" with the first mic choice and placement. I think any of the first three (Kill em All, Ride the Lightning, Master of Puppets) Metallica albums are prime examples of what metal should sound like.