A goodly WW!
I wanted to ask you.. how do you draw lines? Are you using a mouse? I don't know what software you are using (I use Corel Paint Shop Pro 10) but I wanted to offer a suggestion about lines.
My software has various settings for line drawing. Yours may have something similar... One of those settings is called "tracking". Tracking basically tells the software to smooth out the "jags" that happen when you draw a line.
Here is a line drawn with no tracking:
And here is a similar one with the tracking set to 10:
I have no idea exactly what the value 10 means, but I have noticed that the higher the tracking number, the more the software wants to smooth the curve. 10 seems to work well for me.
Maybe your software has this feature? It sure helps making smoother lines.