The render doesn't blend at all, it's pixelated, and it's blurry. I don't really like your new thing of taking parts of the body and putting them in bars, but the bg looks like you jut smudged some stuff and threw a c4d on it.
It looks as though you used the magic wand tool to cut out the render. If that's the case, don't do that again. If it isn't the case, please say so.
I agree with the others, not your best work. But its not your fault that the render is bad, unless you made it.
I made this for a request at GimpTalk. And the bars are bad I know. Im just not using them correctly.