Hunger Artist

In folder with dedicated server there is another one named "mods". Upload there any mod what you want from local game folder(*Path to steam*\SteamApps\common\Don't Starve Together\mods) and enable it by overwriting modsettings.lua with ForceEnableMod("workshop-818624729") where workshop-818624729 is folder name with your mod which you uploaded.

I used your art in mod's description if you don't mind. http://steamcommunity.com/sharedfiles/filedetails/?id=818624729