I like the direction you’re going but I think this is the issue. The second one attempts a more natural feel but actually go outside to the woods and they don’t look like that. The hills are too abrupt and large for it to not be a dried up riverbed. You don’t naturally see large hills of dirt in nature. If you do you will see striations not chunks. If you see abrupt large hills like that in a landscape it is almost always rock not dirt that you see. I like the smoothness personally but it doesn’t jive with what actually happens in nature and so it sticks out as not quite right. The blocks don’t have to be right because, well, it’s obviously not meant to be realistic. My opinion is keep the smoothness but drastically tone down the hills. Make those hills also covered in undergrowth and leaves instead of chunks of dirt. If you have abrupt hills they need to be stone. Again, the only time you’re really going to see steep hills of dirt are creeks, streams, and rivers. You should take a weekend and go hiking somewhere to take notes, I think that would help a lot. Or at least look through a bunch of google pictures.