Here is my very own Oekaki (Paint BBS) tutorial. Whether you are a beginner or a regular oekakier here are some instructions, tricks and tips that may help you. With illustrations

Beginner

Oekaki overlook
The tools

 

Basics (Tools)

Lines
Watercolor
Text
Haftone
Blur
Light
Dark
Shapes
Copying
Antilias
Layerunify
Erasing
Freehand/line

Amateur (Tools)

BG/FG Layers
Normal (mode)
Mask (mode)

 

Amateur

A step by step anime illustraion (covering the following):

Sketching
Watercolor lines
Coloring with layers

A step by step anime illsutration ( with solids)