Its been awhile since I posted last... let's just say I've had some trouble getting the ink to stick to the paint. However, I've somewhat bettered my technique and I'm back on track. I'm in the middle of drawing on the guitar and I thought I would update since I'm sort of between the outlining and detailing phases.
Here is the front of the guitar:

And here is the back:

And a little bit of detail:

I'm not making a video of this step... stay tuned for another installation.