Hey everyone I had no idea I could do this, so I wanted to share the cool possibilities by using Photoshop's Timeline tool to create something along the lines as this for a webcomic banner here on Tapas.
Seems like to me your comic can have a .gif banner with a bit of tweaking and it looks super great! sorry for the small thumbnail post, it's normal size on the comic page. Guardian Core Rekindle
But hey, now everybody should totes do this! HOW COOL would that be if someone clicked your comic and then your banner moved! SO COOL! I wasn't sure if I could use a .gif but WHAO!