OK where trying for a tree pot.
...
You need to round out that pot: remember that the pot is pretty much a cylinder that is smaller on one side (or a cone with the tip cut off).
Maybe thin out that trunk a little, and give it some curve.
I like the palette choice for the trunk, but try lowering those greens' saturation by half of what they are now.
Round out the shrubbery -- look back at your picture for shape reference and shading reference for the foliage.
The foliage needs variation in shading: you've dispersed the light green evenly througout the dark green, and it looks flat and static.
And overall, make sure to try and present enough details in your picture so that the viewer can correctly identify each part: for instance, I wasn't sure at first whether or not that was a pot or a chunk of floating ground that the tree was growing out of. Maybe consider a different color scheme for the pot?
