There is nothing wrong with your tree. It is what we call a silhouette and it is a pretty brush. Problem is with doing a
silhouette, they have to be in the far back. And so with that green bush behind it, it takes away from the silhouette
effect. Everything at that level of depthness of the wall should be black. So put that green bush in front of the tree.
Since silhouettes should be towards the back to show depthness, the tree should be smaller in size and a little blurry.
I have not seen that type of grass brush before. Are you using photoshop 7.0? There is a better grass brush. To add
additional colors, play around with the color dyanmics of the brush.
Like the sky! Nice clouds! Overall, very nice for your first try ^^ Congratulations! Keep at it and you will definitely
get better =)
I hope this helps and I will be glad to help you even more Rhonda *hugs*