I like the look of the swamps just fine.

The mountains, I agree, might need some more work. Real mountain ranges tend to form long chains along fault lines, so the little clumps of mountains here and there are a little odd. Also, they tend to have a few layers, with a high elevation spine in the middle, moving to lower mountains and foothills towards the edges. I'd say the hills at the top look fine, the little chains are ok but might should line up a bit more, and the thing in the middle is very odd.

Still, great starting map and keep up the good work. I really enjoyed the zombie nirvana tutorial.