I embrace that you are crediting the authors now. Here's a bit of feedback on your changes.
Swamp by Asper

Your art picked for Swamp is an improvement - or rather, it looks just as good, but makes more sense, thematically. However, if I ever decide to change the name, I'll let a little more effort go into it than just take your's - after all, Capitols are a bit too modern for Dominion in my book. "Capital" would have been nice, if it wasn't already taken. Maybe something that has the same connotation, but fits the time. I'm open for suggestions there in my thread. Either way, Swamp's always been a bit unimaginative for a Landmark, so I'm not sure it'll stick around, after all.
Original:
Farmer by Asper

Your art for Farmer is rather nice. It's not crazy beautiful, but it's an improvement over my original pick and goes with Cornucopia's "If in doubt, depict women"-theme. If you were willing to tell me the source, I'd consider exchanging it when I have time.
Original:

Scientist by Asper

I still think my image for Scientist is better than the one you picked - I simply believe it fits the style of the game better. At the very least, it really didn't need replacement.
Original:
Edit: Wow, I just noticed you even added my expansion symbol on my cards. Fancy that.