it looks like you drew a tree trunk, use the leaf paintbrush on the top,and then took some grass and slapped it on the bottom and then you added filters and gradients to it.

other things
-tree is pixelly
-gradient sun[?] is out of place and the gradient looks unnatural
-trees dont usually look like upside down pears. more like trees

well.. i think the grass is nice

the grass is also a brush pattern. i recently used photoshop and noticed that

i think that is a wonderful work of art i love how simple it is.. not over rated or too complicated.

3/10 Grass = Amazing Tree= Pixelly (BAD) Sun= Gradient (Horrible)

Grass is a brush, tree looks like some fat stick with weed as leafs, and the "sun/moon" is just some circle with faiding.
Overall more like a PS Starter painting, keep improving.

Ewww.... Horrible Pixelated Tree.
Sorry Thats Ugly.