Artist: Jack Kirby
Uncredited Inker: Dick Ayers
Ah, now this is more like it.
Johnny activating his flame is now being treated as an event, and the focal point of the panel. We have his catchphrase in its own speech bubble and with a larger and more prominent font than the rest of the dialogue. The bubble even breaks the borders of the panel, pushing up against the next panel, giving more importance to the moment.
On the art side, we have a rare partially-flamed Johnny, as the panel catches him mid-ignition. The normal artistic depiction for a Flame On is to have Johnny already alight, maybe with flame to show him towards the end of ignition. but Kirby's art here shows us Johnny igniting from the feet up. It's not a visual that would last, but this early variant is interesting to see.
Check out our coverage of Fantastic Four #7 in our fifth episode: The Strangest Tales Of All