Well, I don't have as much problem viewing you image as the others. In FF you can right click a picture and you have an option to view the image without the rest of the webpage. And FF will resize it to fit the screen.
On your concept art, I have to agree with Star. I'm sorry to say it, but your concept art is not that good. You do have skills but it is a bit lacking. In addition it seems that you draw everything in your own drawing style, which does not seem to be close to MC style concept art. Finally you only scan your pictures and scans are never that good. Here are some pointers that I think will do you good:
1) Try practicing drawing and focus on MC style. Start with Link, Zelda or a Chu Chu, because there are a lot of examples of them on the internet and you can compare your work with those. The closer you get to MC style art the more likely your art will be accepted.
2) Don't just submit scanned in art. The coloring only covers half if not less of the surface. On paper it may look good, but when scanned the white of the paper and the gridlines pop out and make you drawing faded and less visible.
3) It is not bad to start with a pen and paper scanned in drawing, but after scanning, use a tool such as Paint, GIMP or Inkscape to trace your lines and color the surfaces. After which you erase your original scan or what is left of it.
4) Do not focus too much on small details in your drawing, but focus more on the larger details. In the end small details will not make it in the sprite. Consider the size of the sprite that it will translate to. The smaller details are only interesting in the concept art.
Well, I hope my advice will help a bit.