well the tree is a brush thats the problem from get go some times brushes and vectors just dont go together it breaks the flow and contouity and throws perspective off, you can try 2 things, on the tree layer do a control click to select and load the tree layer then fill it with black and since its brushes you may have some dust or pixels on edges now select feather pick 2 pixels then inverse then delete then sharpen now your layer will have a vector feel, second method is try downloading shapes like a tree shape or render a tree and use same load selection technique and on the stars less at times is best that again would benifit by being vectored also or a reduced noise layer, on the text remove it from main focal point make a black bar under the pice and add your text there and not so loud,the water is awesome great job there, your on right track few touch ups and you will have a fine piece.
