Based off of this image I found upon a Google search: http://fc03.deviantart.net/fs70/f/2012/010/0/f/doom_guy_speedpaint_by_gausswerks-d4lzm8d.jpg
Made with MSPaint (Basic outlining, for the early stages) in parralel with Paint.NET (For adding "colours" and shading). It was originally going to have color, but I thought it'd look better if it was entirely in grayscale.
Discussion
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You should work on cleaning this up.