Hmm...on a scale of 1.0-10.0 with 10.0 being the best artwork I've seen, I'd rate this as maybe between a 6.5-7.0. What you can do, is sketch out the characters first, then when it looks satisfactory, outline in fine-point Sharpie. Afterwards, take a large eraser and erase any excess pencil lines. Finally, you're ready to scan. Doing that will improve your artwork a little. Also, it doesn't hurt to look at some reference material before you start. Keep it close so you can get the finer details too.