Very nice work, I am definitely impressed. That being said, there are a few thing I might recommend.
Page 1:
All four of those images seem a bit redundant in there current order. I disagree with a few of the people on here as I wouldn't get rid of panel 1. While it doesn't really showcase you skill with detail, it is a good establishing/mysterious shot. I would, however, switch panels 2 and 3. In it's current order, it is kind of an awkward transition going from the small back shot of the Leader, then to a front medium shot with forced perspective, then to a back angled shot, then to a close up. It doesn't really flow to well, despite being beautiful to look at. Once your able to get the pages scanned, try swapping they're order, I think you'll like they way if flows.
Page 2:
I love the transition from page 1 to page 2. Going from the evil, psychotic look on the Leader's face to the calm, almost slightly bored look on the Hulks face. Good flow. And panel 2, awesome. The only thing I feel this page is missing is there seems to be a lack of reason for the Hulk to be turning to the side like he is in panel 3. It seems maybe there should be a partial shadow on his face, as the Leader's robot approaches, or some sort of sound effect to throw off the Hulks tranquil stare.
Page 3:
Freakin' beautiful. My only gripe is a minor one, but it's one that's already been mentioned. Hulks ears. While yes, rarely will you find a person with a completely symmetrical head, the ear's seem to be off just enough to be a little distracting. It's not just the alignment but also the size, his left hear seems a little larger as well. Of course, this is an easy fix for an inker to resolve, but can also be fixed once scanned too. Definitely doesn't seem like enough to keep you from getting a job though.
Page 4:
I agree with Mrh7448 on this. This panel needs something to break the two apart. It's confusing to the reader without it. It appears the Hulk and the leader are suddenly really close to each other when both the panel before and after show they are not. Also, it appears they are staring on a level surface. Again, a little confusing when we see the Hulk looking up both before and after this panel, and we can see the Leader would be looking down on the panel before. Otherwise, the pacing and action is very nice on this page. I really like the last panel. The look on the Leader's face is great, it's a little bit of that smug/scared look a villian gets on their face when the realize they've been beaten, but don't want to admit it.
Page 5:
While this is an awesome picture in panel 1, the transition from page 4 to page 5 seems a little weak. We can't really tell if the Hulk has thrown down the robot or if it just fallen over from having it's window smashed. Which leads to the problem I think a lot of people were running into with panels 2-4. While I can see what you were trying to establish with these panels (which I really like the view and flow of them), we see the Hulk jump to robot at the end of page 4, we then see the robot fall, but we already feel the Hulk's upward movement stopped once he hit the robot on page 4, and as it topples over in panel one, the viewer feels as if the Hulk should be moving downward as well. We have no panel that establishes the Hulk has made another jump to make him move upward and away from the Leader. The silhouette of the Hulk in the first panel could be changed to show he jumped off the falling robot or he threw the robot down and the downward throw allowed him to thrust himself in an upward fashion. Basically we need something to show the Hulk has reason to be moving upward and panels 2-4 would be just fine. I love the last 4 panels. We can tell the Hulk has come back down and I really like the look of fear on the Leader's face. My only complaint with them is the second to last panel. I appears, but is hard to tell, that the Hulk used some sort of Hulk breath, or possibly Hulk spit to do something to the Leader. I'm sure once these are scanned, it would be easier to tell.
Overall, the pages are awesome. I love the detail you put into each page and for the most part, the story telling is there, with maybe just a few little tweaks needed here and there. I will say that I have seen many other comics out there drawn by people with half your talent. And I'm not just talking about independent comics either. Some of the mainstream books have less talented people out there. So if they can make it, I see no reason you can't make it. It may take some persistence, but you'll get there.
A little bit of advice as well. Having talked to some people that have actually recently done work for Marvel and DC, they (not the big two, but the artist's themselves) recommend trying to get your own comic published. A lot of the newer talent they have recently picked up, they did so from smaller publishers and independent publishers. They have the money, and when they see talent they like, that's selling well, they'll use they're resources to basically steal you from the smaller company. Just some food for thought
Keep up the great work. Look forward to seeing some more in the future.