This may help your linework

Just stumbled across this today.
http://nsio.deviantart.com/art/Nsio-explains-Line-Dynamics-411098876

A lot of it is beginner info. But there are a few bits that are helpful for anyone.

The creator of the tutorial has other helpful tutorials in their gallery.

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Also just mentioning -again-. People that claim they 'look for tutorials and couldn't find anything'. I just highly believe didn't look for more than 15 minutes. Sometimes you have to look for an HOUR. Things won't be handed to you all the time. Don't be lazy. As i've said, i've gotten this far in digital art myself on searching things online and watching livestreams alone. So.