I'll be honest, I can't see this flying over at Marvel. It's a good style for indie stuff (like what Adam Warren did with Empowered) or parody (some periods of Mad had stuff a lot like this), but for the so-called "big time"? Unfortunately not. There are a lot of structural problems that need ironing out that would get picked up right away at that level.
What would be really good is if you could get an assessment of your portfolio from someone who works with Marvel (or DC, whatever) and get them to give you advice on how to strengthen your stuff. I was talking to someone a few months ago who did something similar with an assistant director at Disney. Guy flipped through the portfolio in less than five minutes, then gave commentary that made it clear he saw everything and gave him advice on what to do from there. Saved him the whole application and rejection process, and now he's building a much stronger portfolio. That'd work great for someone at the level you're at now, and get you further than a quick review at a con.