it's really coming together!
One suggestion (and hey, this is just my personal preference!) is you might want to desaturate the green colour or/and add a texture to the overall map (like a grain texture for the grassland OR a paper texture over the top of the map) Can be finicky though so up to you if it's wroth it.
Here are some pretty awesome resources:
Stratomunchkin's Tutorial - comprehensive pdf download
Djekspek's tutorials - he has a library FILLED with individual stuff so have a shuffle through if you like.
Anything by these sexy people Like holy smokes, pretty much everything you could need.
I don't know how many future maps you plan on making, but theres this great book by Jerald Blando called "How to draw Fantasy Art & RPG Maps" which goes through every little thing piece by piece if that's your jam. I doubt you need to go that far, but I thought I might as well mention it :p