Howdy hey,
I modeled this from woodworking plans, a which is good source for furniture reference etc. This is my first attempt at compositing and not much time was spent on it.
well one thing i like is the modeling. Great job on that!
but now on the things to improve. the angle of which the bench is at is off. one good thing to do is not try to line up the object to the picture but line up the camera so it matches the scene. what you should do is add that as a background image. go to camera view and rotate it until it looks better. also, add a ground plane where the sidewalk is to help you line it up.
Next, the lighting of the bench is very off. if you look at the picture the shadows are on the right-front and yours are on the left.
finally add some texture to the bench and i think you would have a much better result.