Just thought I'd make a post about this method.
When drawing the comic, I first write the script (I just scrawl it out on paper), then make rough thumbnails of each page, figure out how large each panel needs to be (1/6, 1/4, or 1/3 of a page, usually - my layouts are boring), and then draw each panel to scale on separate sheets of bright white printer paper. Backgrounds are drawn separately if they're used in more than one panel. I do this all without a lightbox because I am insane.
While the reader sees finished art that looks like this ([link]
), in fact all of the hard copy final art looks more like what you see above. Using Col-Erase colored pencils, I draw the base sketch and perspective guides in pink and the tighter construction lines in red. I then draw over those lines in mechanical pencil (HB and 2B) and ink.
After scanning, I drop the Red channel in Photoshop, so all those pink and red lines disappear!
It's handy to have that 'invisible ink' - as you can see, I use it for making notes, marking page and panel numbers, placing dialogue and balloons (balloons and lettering are done digitally), marking areas that need correction... and snarking at the characters.