Basically, you can submit whatever Murdoc art/fanfiction/cosplay you want.
As long as:
1. It has Murdoc in it.
2. It is not a redraw/tracing of official Gorillaz Jamie art(No matter the medium used). UNLESS, You strongly incorporate your OWN style into it
3. It also cannot be a tracing/redraw of Gorillaz art made by other people, unless of course you have that person's permission to recreate their artwork.
4. No recolors of official Gorillaz art(I.E. taking a official drawing of Murdoc and making his skin purple or something)
5. It must be ARTWORK YOU CREATED, OR A PHOTO OF A COSPLAY. It cannot be a Sims screenshot, a wii character screenshot, or anything of that sort.
Please keep these rules in mind when submitting your deviations or they will be denied.