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Here are some process steps for another one of Chen's paintings. Here you can see what steps he has taken to creating a unique creature. How can you use this tutorial? I would recommend looking over the steps he took and using them as a process for your next image. Also take a look at the final result and try to think of a variation of this creature maybe the next step in its mutation or evolution. Paint that in a simmilar style and setting.
This image was done completley in Corel Painter, but this process is application independent.