Kind of hard to see the detail with the grass in the way. The Poke’ Ball itself seems to be lacking as well, both in shaders, and structure. I’ll post my own Poke’ Ball in a few, so keep an eye out for that. Perhaps it can help you out too.
edit: My own pokeball model is posted, so you can check out what I did to make it. Hopefully, it helps you as well. Aside from that, I’d probably make a small clearing in the grass to better focus the attention to the object in question. Add some more objects in the background like trees, rocks and stuff, or even a fence so as to give a more lively feel. Perhaps look into adding some clouds, an actual Sun, and whatever else you can think of.