Kirby kept his hand in the Iron Man series with the covers for quite a while, including this one which introduced the new armour. Still not sure who actually designed that new look. I always thought it seemed a bit more like Ditko (who pencilled the interior story) than any of the other likely suspects.
I like Mister Doll. What a name for a villain. He looks a lot like some of the Challengers villains.
The Kirby Checklist has this a Brodsky inks, which I’m not sure I agree with. There are some bits that seem like that, but parts of it definitely look like Ayers. Maybe there was some redrawing due to the new armour?