I'll totally check it out the tutorials.
Thanks for the positive feedback 
Your sense of color is very good. What you need to improve is making clean and readable clusters and anti-aliasing (AA).
One of the best beginner reference resource is here on PJ.
Check out Cure's pixel art tutorial: http://pixeljoint.com/forum/forum_posts.asp?TID=11299
And this: LINK
Keep it up! 
Thanks dude. I'm still learning how to get textures and polishing right
Could you point me what can be improved? I know the trees and some of the rocks needs some work.
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Looks very rough and unfinished but the values and colors are spot on.
You just need to clean it a bit.
The colours are amazing!