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[Linked Image from i.pinimg.com]

An early swamp creature illustration by Wrightson, possibly preceding the very first Swamp Thing story in HOUSE OF SECRETS 92 that same year.

This went unpublished for many years. I first saw it in the AMAZING WORLD OF DC COMICS 6 fanzine in 1976, an issue dedicated to editor Joe Orlando and his line of DC mystery titles, that Wrightson contributed a lot of exceptional stories, covers, and splash pages to. Some of which sat around unused for up to a decade later.

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EDIT: At second glance, while there is an earlier version, this is a 1974 version that Wrightson did for THE MONSTERS: COLOR THE CREATURE coloring book, that comics convention host Phil Seuling commisioned Wrightson to do in late 1974, right after he'd left the SWAMP THING series. A set of 16 new full-page illustrations, each accompanied by humorous verse by Phil Seuling, and published in an oversize 11" X 17" format. It was recently re-released in a new edition.

[Linked Image from i.pinimg.com]

When Wrightson sold the original art through Russ Cochran, he offered to color the originals for an additional fee, and buyers had him color 5 of the 16.
I like them in both color and black and white.

Here's a color version of the above illustration:

[Linked Image from i.pinimg.com]

And here's a link to the earlier AMAZING WORLD OF DC COMICS 6 illustration I mentioned, from 1970, that clearly far pre-dates any of his SWAMP THING work :

https://comiconlinefree.net/amazing-world-of-dc-comics/issue-6/2
https://readcomicsfree.com/comic/amazing-world-of-dc-comics/issue-6

Also at :
https://viewcomiconline.com/amazing-world-of-dc-comics-issue-6/

And :
https://readcomiconline.li/Comic/Amazing-World-of-DC-Comics/Issue-6?id=100342#2