Many times the mark of good vector work is not being able to tell that the piece was done using it. This is one of those times; I could have sworn it was a pen and ink drawing for marvel comics. Great job!
I was so unbelievably excited when I saw this because I thought there was a Tri-Force under the awesome Iron Man bust. ...but then I saw that's it's the first Iron Man suit, and I got incredibly depressed.