Photoshop :: From Pencil Drawing To Clean Solid Lines

I am starting with a scanned pencil drawing, which often has very broken, rough lines, no matter how dark or clean I try to draw. I am looking to turn these lines into clean, solid lines, of one uniform color, for use in another program which relies on completed loops and no breaks in lines.

I've tried tools such as Trace Contour, but this isn't doing quite what I'm looking for. I'm very new to Photoshop, so I'm hoping there is something I am missing. Something like the magnetic lasso would work wonders, if only I could brush that line instead of making a selection.