So here's my thoughts after reading your stuff.
First things first. PROOFREAD. If you plan to be taken seriously, take yourself seriously. For example on page 5 your hero says "Whhat?! Arest me? Come on dude, I just caught this guys!"
If I'm not mistaken, this should read "Whaat? Arrest me? Come on dude, I just caught these guys." There's other spelling mistakes that taking the time to proofread or finding a friend to proofread will fix.
Now onto the art. The obvious first comment is that you need to practice anatomy. A sketchbook will help with this. Like @Shanny8 said. Practicing with reference is the way to improve. Think about it this way, learning to draw is really just learning what things actually look like. We all have an idea of what objects, people, ect, look like, but most of our mental images don't actually match the reality of the situation. Learning to draw is learning to pay attention to how things look, understanding how they sit in space, and knowing how to construct the object from shapes and forms into an images that is convincing.
Next, your backgrounds are sparse. I used to despise doing backgrounds, so I feel your pain. I just wanted to draw the characters. But if you ignore the backgrounds, your story loses a feeling of location. Every scene will blend together and your audience will become lost quickly. This was the biggest problem with my first attempt at a long-format comic. The backgrounds were blocky and crude, or empty and barren. I wasn't using reference, and it really showed. My current comic (here if you care) began with a ton of backgrounds, because I was forcing myself (and still am) to learn and care about the space my story exists in.
If you're really looking to pursue professional superhero comics, you need to start drawing from life. Take photos of places you're familiar with near where you live, and draw them. Feel free to trace your photos at first. This will force you to really look the image, and will over time teach you how to translate objects into lines. Lines don't exist in the real world, but they're all we have if you're drawing in pen and ink. Learning to bridge the gap between reality and linework is hard, but rewarding.
My final thought begins with a question. Do you, when you're sitting down to plan your page, draw the whole page? Or just individual panels? I ask because a lot of young comic's artists think that the panel is king, and if you're working in a vertical format or a strip format, then that is true. But you my friend are drawing pages, and a page is a whole piece inside of itself. If you start thinking about the layout of your entire page, you begins to learn how to properly make your page balanced and flow well.
You've got a lot of work ahead of you, but choosing to start and make a comic is the only way to learn! Hopefully this had been a little helpful at least.