Nowadays each set comes with 4 variations on the lands that produce mana, but back in 4th Edition (and earlier), there were only 3 variations. Here is the first “Forest” that you could choose to use. Some people didn’t care and would just grab however many forests they needed for their decks without looking at the art. Others would choose just ONE artwork version and make all 22-24 lands the exact same. Other people would choose 8 of each land exactly and others would do some mix. It always depended on the person making the deck.
I always found it interesting how the various mana cards managed to convey the “sense” of the land they were representing. A Forest is much more than just a bunch of trees all in the same place. As a land surveyor, I know this all too well. Small bushes and rocks and trees all make up what you stumble across when you’re running for your life from a bear, especially if they happen to be angry mutant magic bears! 😉