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To blend it properly with the rest of the image change the Blending Mode of the GLASS from Normal to Screen. (Remember that you used the same blending mode to blend bokeh? Principle here is the same - you want to make black transparent and white let visible, so Screen Blending Mode is the best choice for you.)
Now grab the Lasso Tool (L) and select one of the pieces of glass. Then grab the Move Tool (V) and move it on butterfly. Press Ctrl + D to deselect it. Repeat the same process over and over again till you fill the whole body of butterfly. It may sound bit boring but trust me that it takes no more that ten minutes.
Your butterfly should be similar to the one below after you finish with this step.
Step 21 - Adjusting the Glass
If you look at your picture right now you can see that the butterfly would look better if it's bit brighter. You'll fix it in this step.
Add new adjustment layer Levels and set the Input Levels on 12; 0,85; 227.
You want to make brighter and more contrasted only the butterfly not the rest of the image. Fill the layer mask of Levels adjustment color with black color. Then grab the Brush Tool (B), set the Opacity on 100% and pick white color. Paint over the butterfly.
Step 22 - More Bokeh
Right now the upper part of image is too empty which doesn't look interesting. The whole image also looks static. It will help to add some more bokeh.
Bokeh in this image is not just because it looks nice or something like this. In fact it A) represents blurred pieces of glass and B) helps creating impression of space.
Drag "big bokeh" textures into your photo manipulation and place it on the top of all layers. Name the new layer BIG BOKEH and change its Blending Mode on Screen to blend it properly.
Because you want to create impression of space this bokeh should look like it's in front of the girl. Because of that it has to be bigger that other bokeh in the picture. To do that press Ctrl + T on your keyboard and make it as big as necessary. Press Enter to apply the changes.
If you look at your picture right now you can see that there are some empty, uninteresting places. I highlighted them on the following picture so you can better see what I am talking about.