This is a nice start.
This is what I would consider to change on the image: The animals and some veggies are out of proportion. Like the deer can be bigger, the rabbit(i would probably not keep it as it looks like Photoshopped into the render) smaller, the duck? looks pretty tiny and the yellow wild flower is almost as tall like the tree next to it.
If u go here:
http://www.terragen.org/index.php?action=tpmod;dl=0you will find animals and a lots of good stuff for TG.
