Steel , blue , and orange? not a good color scheme.
Also, I see that you were trying to blend the render in, but you never smudge the render unless your going to do something with the smudge lines, or just blend the render in by smudging around it.
Take this for example (SAVExTHExWHALES' work)
He smudged the render, but outwards and not clumped together.
Also get rid of the random backrounds. I prefer stocks because they give you a backround to work with.
Hope that helped.