Picture One: Very bland. Needs more environmental doodads on that grass, A LOT of more tiles(dirt, rocks, grassy dirt, darker grass...), etc. Your height variation seems fine and at least you didn't use Blizzard water. You have grass growing inside the water, which is unrealistic. Your river just suddenly ends at one point - makes absolutely no sense. Either make it a big pond\sea\lake\whatever, or extend the river to the end of the map. Your river also seems somewhat shallow.
Picture Two: The waterfalls make no sense whatsoever. They are coming out of a ROCK, and the rock itself is a big, random slob. I suggest you to Google "Waterfall" and look at what waterfalls really are. :/
Hint: They're NOT random streams of water magically coming out of pure rock cliffs. So please, add a river or in general, a source of water that carries the water to those... Waterfalls. And seriously, remove those weird slabs of rock, they make no sense.
Asides from that your terrain is very bland. It is flat, has only one type of doodad, uses only one tile etc. I could only suggest you to look at terraining tutorials and learn from them.