I love that scan. ^^

Ok, here's what I think. Get rid of that texture, it's too repetitive looking and throws the cleanness of the scene off in my opinion and it just doesn't need it.

Lessen your birds, and make them smaller and darker, because the look so flat right now, and the way the sun is, it won't be lighting their underbellies! So they need to be dark.

Your water and clouds look fine to me, but that text, the black color and the size of it is an eye sore. Why don't you make the text smaller, and make it a lighter color like white? Try different fonts too, I don't think that font quite goes with it. You could make your text glow too, if you want it to standout.

And change the font and color of your signature at the bottom (Make it white) I usually make my signatures in a non cursive, print font so moderators can read it easily and know it's mine.

I hope this helped you out. =)

Edit: Oh yeah.. Bigger resolutions please! X__X

Thanks for your advice, I gonna work on it

Remove the text. its unnecessary. either change the font color or change the font itself, its hard to read.

I agree remove the texture, but the words may be OK, they do not seem to bother or distract. Your English is really good.

Nice wall! It'd be nice if you could perhaps make the horizon a bit more clear. I think that it'd be better if you'd lover the ocean a bit too. Other than that, I think it's a neat composition (textures included)

Thank you everybody, I'm working on it

I love the overall effect of the wall. It's so happy and cute.
But, the water could be made more realistically and the text could be better.