About the marshes: If you want them more distinct you can use the same groundtexture and then merge a colour on to the texture, you can also increase the ferns and ivy. Then in the groundtexture editor there is also this option where you can choose "m per tile" Here you should increase the value from 1 to between 5-10.
horrible race.
Seriously, get rid of the marshes! I agree, distinct marshes is nice, but these ones are just ugly... Doesn`t look realistic either. Otherwise it`s quite nice.