Bonus: from the same issue of EI, comes this fan drawing of the Mutara Nebula battle.
Bonus #2: Publicity photo of Kirk once again baffling Spock with his propensity for somehow inexplicably winning against the Vulcan.

"I only peek in the line of duty. Now, get undressed, Nyota."

By coincidence, this photo of McCoy perfectly matches the position of his head in the painting.
Bonus: Below, the cover of the "Wrath of Khan" paperback adaptation, published in July of 1982. After the "leisurely" pace of the previous movie, I (and many fans) were ready for some action, and by George, we knew from the moment we heard the title that we were likely to get it. The return of Khan! I was super excited, and picked up the novelization a few days before the movie came out. As I usually did in such cases, I read about 75 percent of it before stopping, in order to preserve any surprises that the ending of the movies brought. I was glad I did, when I saw the movie. Although the cover art is uncredited, it shows all the earmarks of a Bob Larkin painting, so that's my best guess. Anyone know for sure? Update: Two commenters think it's by Boris Vallejo, so it probably is. He did some great covers also. When I find out for sure, I'll post it!
Next: Another painting in the set; and if you say one word about what he's wearing, you could get kilt by this manly bearded swordsman.
The sleeping bag allowed one to really "get into" Star Trek more literally.

"Fully functional, you say? I've been called a love machine myself, sometimes."