Simple isn't necessarily a bad thing. There's quite a bit of residual image in the silhouette, try the magic wand to select the white and then go to selection and choose similar to remove most of the white. ( you may have to adjust the strength of the wand and also need to touch up the tree trunk but that won't be difficult.) The rock base is too soft, try to make it look like it's in there with the grass. That foreground "ridge" looks odd but maybe that's what you wanted.

with grass like this maybe u should try with some other (darker) sky...best of luck

simple and simply the best!

The grass blades are very small, and the base of the tree is very soft, the edges should be a lot harder where the tree meets the grass, i also think that the horizon is too sharp and too linear. Good luck!

Good picture! Work on your masking techniques.