The "Dinosaur Island" artist (1946-48 at DC), Paul Cooper, works on Sub-Mariner at Timely before moving over to Batman. He has more than one inker here (possibly one of them is himself—who knows?). The figure poses are the better way to find Cooper's pencils when close-ups of faces show more of the inker's style.
There are a few other stories from this period that I've spent days considering and finally decided to leave off the list, and it's the inking that's made it hard to tell.
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For what it's worth, in every story below, the final panel closes as you see in "Horror Island"—with "End", rather than "The End" as in the other features in these issues.
Paul Cooper pencils on Sub-Mariner
in Marvel Mystery Comics
in Human Torch
in All Winners
in All Select
There are a few other stories from this period that I've spent days considering and finally decided to leave off the list, and it's the inking that's made it hard to tell.
For what it's worth, in every story below, the final panel closes as you see in "Horror Island"—with "End", rather than "The End" as in the other features in these issues.
Paul Cooper pencils on Sub-Mariner
in Marvel Mystery Comics
| Sep/45 | 66 | Sub-Mariner vs. the Murderous "Zako" |
| Nov/ | 67 | The Lost Soldier |
in Human Torch
| Fall/45 | 20 | The Carnival Murders |
| Win/46 | 21 | Murder in Blackout |
in All Winners
| Sum/45 | 16 | The Fabulous Racket |
in All Select
| Sum/46 | 10 | Horror Island |