I don't know, maybe it's just me, but I think there's more and more tutorials out there with pixel art's rising popularity, especially on YouTube lately (
example) and not-free on places like Udemy/Coursera.
The classic list from Pixel Prospector/Pixelartus always hits home too:
http://pixelartus.com/post/126601293636/pixel-art-tutorialsI'm trying to make one of my own too, but so far have only a lo-fi prototype in google slides:
http://www.retronator.com/gettingstartedIt gets a bit too tough too fast from days 5–7. But this is just a test, kind of feeling the waters with the content. The second version of it will focus specifically on teaching how to make pixel art for games. It'll be the first episode of my game Pixel Art Academy, hopefully available end of this year. I haven't published this yet, but here is a draft of all the free content I made this year during development of the game:
https://medium.com/retronator-magazine/736c8e9bfbaaIt has the Getting Started tutorial mentioned, but also others (1 Week Challenge has lots of good links to tutorials). But this is stuff I wrote, so not really what I know that helped myself (although others say they helped them).
For me personally, from free resources, I took most away from
Feng Zhu's Design Cinema. But that's general for digital painting. For pixel art specific, Glauber Kotaki's
run cycle tutorial has given me the most understanding of how to make animations look great. When it comes to understanding art/shading/theory I respect Arne Niklas a lot so
his tutorial is something I like. And for game tiles, I've really found useful the chapter
De-mystifying the Greats in a tutorial by Tsugumo.