Lighting on the render is off and the blending isn't too good.
Try work on your blending, add some gradients/try find a render that fits the flow of your background.
The render is not compatible with the background. The flow and blending are decent and go together. I would of used another render that blended a little better. But all in all it looks decent good job.
Your welcome.Thanks guys for the feedback. I'll try to implement it on my next one.