The render is a bit blurry towards the head of batman and the smudge doesnt look too natural (you can tell where u smudged his shoulder down a lot). But besides that its good. Hmm... Maybe try taking a soft eraser with some opacity to it and try to smooth out that smudge or take the smudge away and try to do a combination of the soft eraser and smudge.
The smudge wouldn't come out with a simple swipe of a soft eraser, but I do agree with you on the head part. Look's a little blurred and pixelated.
It looks nice other than batman himself. He's a little too sharp around the chest, and the smudges just look weird. However, I do love the background
