Illustration for my comic Debaser! You can read it here www.spunchcomics.com/eng
No problem ^^ You actually have to create a Linework layer before the vector pen tool appears! Click on the small layer icon, the one with the small pen nib on it, and then you'll see the vector pen tool in your toolbox!
Quick question, what tool did you use to color/ lineart this, and what paint program did you use?