>>5713163Make sure your pressing down enough on the marker, it looks like some of the lines are light. Another (and easy) option is to get a .5mm mechanical pencil like below (because of the exposed writing portion). You can control how dark your lines get based on pressure and going over the panel a few times. I used on my Tallgeese III here for example.
http://www.amazon.com/Alvin-Draft-Matic-Mechanical-Pencil-DM05/dp/B007VTP62U 