This tutorial is meant for beginners who just started photoshopping... However, some knowledge of the pen tool is recommended... For those who never used the pen tool, I included a mini tutorial explaining the very basics.
How to Colorize Line Art with Cell Style Technique
How to Design a Strawberry and Make It Melt
How to Create an Illustration that Fades from Line Art to Color
Step by Step: Restoring an Old Torn Photograph
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