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I'd like to contribute something.

here is a few links to browsing some tags for tutorial on Pixiv. popular terms include course (講座) beginners (初心者向け) and making (メイキング) of course all of these tutorials are in Japanese, so unless you can read Japanese, it limits which tutorials are useful. however most of them you can just look at the pictures and draw from that.

course
http://www.pixiv.net/search.php?s_mode=s_tag_full&word=%E8%AC%9B%E5%BA%A7

beginners
http://www.pixiv.net/search.php?s_mode=s_tag_full&word=%E5%88%9D%E5%BF%83%E8%80%85%E5%90%91%E3%81%91

making
http://www.pixiv.net/search.php?s_mode=s_tag_full&word=%E3%83%A1%E3%82%A4%E3%82%AD%E3%83%B3%E3%82%B0

I've found that the easiest way to find other good tutorials is to make an account and favorite tutorials; which then takes to a screen that recommends other works based on their tags.

I hope this can help everyone! It has certainly helped me practice and improve my performance!