A map in your first post - way to go! And it's a good start too. I think the issue with the mountains is it looks like you've generated a screen full of random roughness and then clipped it with land shapes, rather than the specific roughness of a set of hills and mountains causing land to stick up from the sea. For that matter, maybe it's the contrast issue Ravells pointed out, but I keep getting an illusion that the land is below sea level.

The roughness being a bit random, some of your rivers don't match -- like they go up and over hills. Tricky water you have there :-).

Keep at it it - you've got some good stuff going on. By the way - welcome to the Guild!