Someone else is having this issue as well, so I know it's not on your end. The issue that I'm having is that I can't replicate the error so I don't know what's going on. I've tried running in the extracted version of the game, buying it through normal means and it shows up just fine, no problems. I tried importing the image again, so give it a try again with the newest version. A few questions; Are you able to meet the angel at the top of the mountain and have the image work fine? Are you on PC or another system? Are the other cards working?
I saw in your announcement you were looking to see if people could see the centurion angel art. I'm putting my status here so the data is collected in one place. I'm able to see the angel's art, both when meeting him on top of the mountain and when viewing his card from my inventory. I also tried checking the card both before and after his introduction scene, but it did not cause issues for me in either case. I'm running the game on PC.