Cheers both! Yeah the land needed changing, I was having a bit of a mental block yesterday and couldn't see how to apply the textures to just the land (still pretty new to PS). But I've added a few layers as clipping masks with different colours and textures. I wasn't really sure where I was going with it but here it is as it looks at the moment. What do you guys think?
Added some more colours so the green wasn't so bright.