A pencil/pen/charcoal guide I whipped up. A quick refer-to guide for all your pencil/pen/charcoal needs!
NOTE: Gel pens are best used as 'spotting' and for effects as getting them to streak on straight-up pencil is quite difficult. I suggest using an opaque Galaxy White marker instead as it produces the same results, but is much easier to use.
The whites have borders around them since they were washed out in the scanning process. Done in a moleskine, but these pencil effects can apply basically anywhere.
If you have questions, feel free to ask. I hope it helps!