Iron Man - hand - in progress

How are you scoring the folding lines? I'm not sure about how you do it, but nevertheless I have an advice for you.
 The trick is to go over the folding lines with the x-acto knife, use a ruler to draw straight lines, just hold it down very very softly, so you don't cut it off. (using thicker paper would be an asset) As a noob you can use a pencil, but with the knife it's much cleaner. Don't use a new sharp blade, use an old one that's already a little blunt, by doing so the risk off cutting/ripping some flaps off is minimized.