These are awesome. I love the style.
Couple comments on picture accuracy, which I am sure is becoming annoying.
The Trans Siberian railway card looks like the train is being destroyed, though it is hard to tell. Not sure if that is what you want to convey. I thought you had a different pic for that, you must have changed it.
SP Artillery card is not really showing a SP Artillery piece. Looks like a German command car with some machine guns on it. This is what you are looking for, though something fitting your style of pictures:
Long range aircraft card is showing a picture of what looks like some sort of experimental German flying wing. To me that does not say “long range aircraft” and is a little misleading… but that is personal opinion. Maybe a picture of a P-51D with drop tanks would do the trick. Those are pretty popular so I am sure you could find one. Like this!
or this! a classic.