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Did this for a TV show a while ago. Can't say anything about it, but there's an alien. ;)
Did this with my set of Digital Pencil Rendering Brush Pack that will soon be available for download. In the meantime, you can download my Comic Book Inking and Concept Art Brush Pack here: bit.ly/RayDownloads
See another example of those here:
If interested in purchasing my brushes
This art is available to license as well. Same email.