i did not do the SP+ one.
As for the mastemon's one, its very messy, i merely cover up parts that would show other LR in the background. Paint quite a bit, combine, use a few LR background to save time and make the card look real.
this is what it looks like if i take mastemon out:
as a fast process i would not paint the entire background, i'm sure the DH team have the background without any digimon in it, also i could show you my process and workflow if you want to. but its messy haha.