The art is very cool. I have one global suggestion though.
The only problem with Spoils artwork is that the graphic area on the card is too small. Too small for the very detailed drawings to show their potential.
Many of the graphics have a hidden "story" or a joke but they are often barely visible. The same goes with characters. I can take a closer look on Jo Ciendilo only because I have enlarged scan on my PC.
Spoils artists do a great work. But you do not have to show the entire drawing. IMHO you should enlarge part of it, "zoom in".
This should help playing the cards as well. In most of the tcgs you look on the picture and recall what the card does. In Spoils some darker pictures [in Arcanist deck for example] do not differ much and you have to check the name of the card to make sure you have the right card in your hand.
Thats all, I hope I made it clear. Be safe, regards.