Okay what I did was use the wand on the fence and held the shift key while selecting till I got the entire fence then copied and pasted into a new layer went to am and rendered shaggy against blue background so I could select then inverse and get shaggy brought that into PS then pasted a few times into image adjusted position and got this. I did not try to overlap model with the fence that would have required a fence layer with alpha in the AM window along with the background
background.zip same shot as photoshop file