I know this is a week old, but hey, I'm pretty new here. XD
ANYWAYS, my critique on this is that the render and the background look like separate parts to me. In other words, the render needs to be blended more. Maybe its the lighting? Or just the contrast of colors in the dark background and the light colored render. I like the smudging in the lower part of the background as well as the cinema border. I think you can you make a few adjustments and make it more awesome.