[draygin]

Man where to begin...

The tree's dont use a bunch of images to make up the forest like that. Use the actual tree tiles and join them together. It looks alot nicer

Your river is straight. Try to change that and make it more curved and wha tnot. Also maybe change up the type of stream bed have some sand etc.. Also tile error in the corner where the river turns.

Grass I recommend checking out one of the tutorials stickied above. It would at least put you in the right direction.

All in all this is a very basic beginners level. It definatly needs alot of work before any one would find it playerworld quality.

Once you get these three major things taken care of I would recommend reposting it and getting further feedback on how to enhance it. But for the time being I think you should just focus on that.