Let's talk about painting tutorials!
Here are some of the youtube channels about design, painting techniques and layout that I like a lot.
While there are some things all these artists do, they still each have their own way to approach design, layout and the general painting process.
Generally no one is perfect and the work process has to fit the person and the preferences of the artist, so it can be a great help to watch how different people work and take in their opinion, before finding your own way to paint.
Aaron Blaise : worked for disney. In his videos he talks about animation and character design (especially animal characters), layout and the industry as a whole.
Borodante: A digital painter, that gives great tips when it comes to painting in photoshop in general. Especially his videos about lighting, the advantage of keeping the number your layers at