Here are some of my favorites.
Sketch from John Pound who did most of the card fronts for the original series.


Jay Lynch did card art for some of the later series in the OS run.

And finally my favorite sketch card, also one of my favorite cards period..
Super detailed sketch card from Tom Bunk who did most of the cards back for the first half dozen or so OS releases. He moved to card fronts as well in later releases.
