Awesome style and background!!

 okay man, i put a sprite in the mockup, maybe i'm gone to make this game real

That's much more readable, but the black of the trunks looks kinda out of place. I'd make it a bit lighter, perhaps the same color as the sky or somewhere around there.

thank you guy, i edit the pic how does it look now?

 The grass looks nice, but the trees look pretty unnatural. The edges are too sharp; I think there should be some anti-aliasing or something. Furthermore, the branches should continue up into the leaves.

I think you need a different tile for the sides... Grass uncommonly grows like that. Also, the tree does need to be darker.

Hey, looks pretty nice! However, I would strongly suggest making the trees in the background appreciably darker than the grass. That'll help separate the foreground and background.

 Relly Nice, I like your trees :)