Page 4 process

I wanted to show process on creating a page. You will notice I blueline everything in Photoshop. How do I do this?
You can go to IMAGE>MODE>MONOTONE. From there, you click on the color swatch and choose a light blue. When you print, your image will be light enough for you to ink over. This has saved me a lot of production time and is a bit easier than inking over dark graphite pencil.