Since I'm going to draw some more 1plus3 stuff soon I made myself a pencil brush.
There are two settings in this pack--one for lineart and one for soft shading.
Feel free to tweak the settings as you wish, there's also no need to credit me, just don't pretend you made them.
(Though it would be interesting to see what you can do with them--I'd gladly look at your work!)
Made in CS6, but the settings are fairly standard, so it shouldn't make any problems.
Another example of brush use: