I'm not that studied on the artwork credits in terms of who did what...
you should check out the Master Lists for the past 3 series and compare the cards to the artists listed. It's a fun study and you can really start to see the style and characteristics that each of the artists bring to the sets.
To me though, to go back to my earlier statement, I feel that JungHwa Im is single-handedly destroying the Wacky brand. If there were only a handful of pieces per series I wouldn't be on a rant, but JungHwa Im did almost 50% of the base set for both 2014 (21 pieces) and ANS 11 (19 pieces), and I find most of them unfit for inclusion in the sets.
The art consistently lacks precision and any sense of realism. Perspective is usually poor, the lettering is never crisp, the characters are typically simple 2-dimensional cartoonish figures, and cylindrical objects are consistently out-of-round and just awful in their execution.
Chock Full o' Newts is a prime example of everything I mention above - looks like a color rough and not finished art.
I don't know if it's actually a JungHwa Im piece, but it certainly has all the traits.
Perspective?, characters? and cylindrical shape? - poor, poor, poor. Look at that can lid!! I cringe at its ineptness.