... Warning traditional? Y'know, there's nothing wrong with doing traditional art. xD It can look just as nice on a screen as digital does. The only difference is that image quality is easier to mess up when trying to upload traditional stuff.
I'm guessing you take pictures of your drawings, right? You just have to take 'em in a more well-lit room, or outside on a bright day. :3
And of course, you can mess with the contrast and stuff once they're on your computer. I do that for pretty much every drawing I upload. It may take some experimentation to figure out which effects work best for you (I usually use black-and-white, then a combination of contrast/brightness, sharpen, and reduce noise), but it generally helps improve image quality a TON.