visually is the quickest way to tell. the feeling based mechanic would've been way too time consuming... And players would still Need to look to see which genuine card it is.
Originally i had a stamped version of the words 'fake' and 'genuine'
They didn't add to the art or the style. The paintings are wrapped up for shipping - to dispose of if they don't sell at the black market.
I fiddled around with the idea of a customs stamp, tried a few templates of one. I even considered UV spotting over the painting part of the card.
in the end i settled on a very small, very simple 'seal', which is ascetically very pleasing!
And thats it, the evolution of the genuine artwork!
Big Man Murph.