Those lines behind the render don't fit imo, the blur around her shoulder looks clumsy.
That horizontal line should go behind the plush but still in front of the girl, that way it'd feel locked within' the image, rather than placed upon it.
The two darker lines on the left and right sides feel weird, lastly some letters are a little blurred (especially the N).
If we wanted to be technical, the light in the render comes from the front-left, while in the image as a whole it comes from the back, but that's not a big deal.
What i'd like you to do is to fix that horizontal line as mentioned above and see the difference: it'd look just as simple but it'd blend much better.