As previously mentioned here, in the mid-’80s freelance artist Dave Dorman painted fully rendered presentation pieces of characters already sketched out by figure designer Ron Rudat. These were internal-only to Hasbro, and not intended as package art or for public consumption. Even at this stage, a Joe or Cobra could still get nixed. From 1986, here is an idea for a Dreadnok that didn’t make it further. Note the misspelled name.
I’m not sure what that weapon is on the left. If you know, please reply in the comments. Dave Dorman’s art book has this and seven more presentation paintings, his “G.I. Joe: Frontline” covers, along with a chunk of Star Wars art and the like.
There’s some nice texture in the paint on the tree, click to enlarge: