The Annotated Wacky Packages All-New Series 2
Several years before he was commissioned by Topps to produce art for their new series, David Gross created a number of "homemade" images inspired by Wacky Packages. A version of "Twits" that is very similar to the ANS2 piece was among them.
Several of Gross's homemades can be found on the archive of John Mann's web site at wackypackages.org: David Gross Originals
The Topps Vault sold the finished art for "Twits" for $1351.00 in an eBay auction which ran from February 8-15, 2006.