ok for the lines on the tube first of all, get your tube with the amount of divisions for th amount of panels you want around and running down the pipe then goto your toon panel and assign a new outline to the model, take this and turn down the min crease to 0 and turn Hard Edges Only to OFF this will then give you a clear outline of your wireframe, you an also turn down the Max crease Value to 0 to get thick lines

then convert your paint strokes to polygons and delete history and you have a nice look like in the images

I have attached a quick sample of what I mean

Hope it helps