This was a bit of an experiment for me. I blurred the background by making a duplicate layer, blurring, adding a layer mask and then revealing the girl through the layer mask. It’s not perfect, and in fact, the closer I look the more imperfections I see. Unfortunately I never saved a .xcf file preserving the layers so this is the final product.
I like it. The blur successfully separates the girl from the backgrond and even the zone of sharpness takes in some of the ground around her which exaggerates the effect!
Taken on St. Patrick Street, Cork last October.