Now, change blendning mode to Overlay. Petals will look like damaged and destroyed.
It's time to decrease Saturation - rotten petals would be monochromatic. Add adjustment layer with Hue/Saturation. Then, with the same brush as in 14 step, erase part of the layer.
Ok! It's time to load brushes. Choose debris brush which you want. Load it to your Photoshop.
Now use loaded brushes on "Rose" layer mask. Click on mask canvas at right side and use black debris to mask rose.
Back below layer with rose (and above layers with branches) place foliage stock. Follow golden proportion guides. Duplicate it several times and transform it (Ctrl + T). Use golden ratio proportions to make focus point. If it's needed, mask some of leafs.
Above first layer with foliage stock, add new layer (ctrl + Shift + N, or Layer > New... > Layer). Pick 60px soft brush and draw some shadows below leafs.
For more realistic effect, decrease its opacity to 60%. Absolute black doesn't exist in real - remember! :)
Add another new layer, just below rose layer. Use the same brush as in Step 19 and draw shadow below flower.
Decrease opacity to 40%.
Your composite is beautiful now, but let's tweak it up! :) At first, back below branches layers and place "Blood splash" stock. Use trick from step 5 to mask it. Blood will give some emotions to this work.
Create shadow below this layer. Click on "Blood splash" layer with RMB and go to "Blending options...". Choose "Drop Shadow" option. Set it as is shown.
It's time to add the blood some expression. Add adjusment layer (shortcut or Layer > New Adjustment layer...) with Brightness/Contrast. Click on it with RMB and choose "Create clipping mask".
Now, add Hue/Saturation. Also make it clippy.
Add new blank layer (ctrl + Shift + N, or Layer > New... > Layer). Click on it with RMB and choose "Create clipping mask". With soft, big brush draw shadows on blood.
Decrease its opacity to around 45%.
Ok. Go on the top of layers. Place "Jackdaw" stock.
Use debris stock to mask unwanted parts of bird. Just the same as in step 17. You can use several kinds of brushes.
I think this bird is too contrasted. For fixing it, add Adjustment layer with Brigtness/Contrast. Then, click on it with RMB and choose "Create clipping mask".
Remember, that you can mask also Adjustments layers. Click on white canvas, on the right side of Adjustment layer. Choose big, soft brush and mask right side of bird. His left side would looks like flying out of the damaged parts of flower.
Now you'll create debris effect. It will give your work dynamism. Add new layer. In Clone Stamp Tool choose desired debris brush. It allows you to copy one area of an image and place it onto another area. Set Aligned sample: Current and below. To select the area you want to copy from, move your mouse to the area you want to duplicate and Alt-click (Windows) or Option-click (Mac). The cursor will change to a target. Click the exact spot you want to start copying from. Clicking without alt (or option), will make a clone. Try it out! :)
Follow golden ratio proportions. Fill them with debris clones.
Optional-but-fine: Place crow stock to your file. Mask it as in step 17 or 26. (Black debris brush on mask)