Another Thor cover from before Kirby took over the interiors for the series full-time. I always like the way Kirby poses Loki, always very confident and sinister.
The Kirby Checklist credits this one to George Roussos, but I’m not sure about that one. I’m going to have to compare it to some other Roussos from the period.
(Ayers with some retouching by another hand seems to be the consensus from the comments)