Terrain generation looks too smooth

I have a basic terrain generation algorithm, and though I'm still working on it, I'm running into a problem where the ground looks too smooth. I'm trying to make a poly-based game, so I'd like the ground to look more like a collection of triangles, but instead it all looks continuous. Here's a picture of what it's doing right now-

and an example of what I'd like...

Terrain generation looks too smooth