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Not at all. I don't think there is any reason to restrict the kind of art or manner in which it's created. Someone could do a pencil drawing and upload a photo if they like. I hope that helps :)

Within the context of the project, ideas and characters can be revised, refined etc. So a pencil rendering of the Nanomancer for the purpose of Themis competition could become a digital piece further down the line.

Cool :)
Thanks for clarifying ☺