Well Sanae made good observations... for the gfx section normally depends of participations needs 2 persons because one cover another when for example this one have unsure in real life. =)
If they have maturity they are able to organize themselves and what each one will do, and when one need to cover ask for another, etc. =)
Only to be host of the competition i think dont need to much gfx skills... just need to know certain knowledge of gfx, for not allow reaping other people job (minimal gfx made on the sig, not just crop the pic and put text), and maturity to deal with trouble maker... yes sometimes have, without lose the "composure" or act poorly education or argue unnecessarily or getting offended easily with members sugestions. =)
For make something for the site as art, well needs more gfx skills, but as for example NH that im in too... has a lot gfx mods... because the art of place, modding section, etc.
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Hadriel: i guess you are able to choose 4 person only for section... one written competition host and another 1 sotw host, and another 2 to cover them and help mod section. After if grow up can make another kind of competitions like photography, large piece, icons or banner for the site also are able to do competitions, etc... You are able to define leader of them more maturity if it has any problem. =)
I hope could help. Already many volunteers to be host... i will not. =)