I don't have a cool gif, but I do usually save my work at various stages so, here's that!
Step One: Very rough sketch, making sure balloons fit, completely changing panels I don't like.
Step Two: Perspective grid in photoshop
this is normally an ENORMOUS file in order to be big enough to fit all the vanishing points on there. I mask each panel's perspective grid so they don't overlap each other confusingly, then convert that to non-photo blue and print it out to pencil it.
Step Three and Four: Pencilling and Inking
* changes yet another panel in between roughs and pencils *
Pencils get scanned in, converted to non-photo blue and printed back out on cardstock for me to ink with ballpoint. I'm one of those people who likes to work with really tight pencils so I don't have to invent anything when I get to the inking stage and can focus on line weight and such, so I don't usually change much at this point!
Steps Five through Nine Billion: Colour It and Letter it
My colouring process involves an underpainting to adjust the lighting of the scene, so my flat colours are baaaaasically just local colour. I've started working on being more flexible about this lately, but since choosing colours is a huge weak spot for me, having a place to start from helps me work a little faster!
I digitally hand-letter; it's the most zen step.
And that's the basic overview! Altogether this probably takes me somewhere between 10-15 hours, but I haven't timed myself recently.