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Go to Edit > Puppet Warp and use the pins to change the pose of the child's head and dress to make her look fit the position of the butterfly.
Add a mask to this layer to hide the bottom of the child's dress to make her look like sitting inside the flower.
Make a Hue/Saturation adjustment layer and change the Master settings:
Create a Color Balance adjustment layer and alter the Midtones values:
Make another Color Balance adjustment layer to bring more yellow light on the front of the child. Paint on the shadow on the left to remove the effect there.
Add a Photo Filter adjustment layer and pick the color #fff229. On the layer mask, paint on the child's skin and the upper of the arms and shoulders so they won't become too yellow.
Make a Curves adjustment layer to give the front of the model more dreamy. Paint on the shadow details so they won't be affected by this adjustment layer.
Open the leaf wings image and isolate them from the white background . Take the leaves on the second line to add to the back of the child. Place this layer below the flower group. Duplicate this layer and flip the wing horizontally and move them to another side of the child's back.
Take another leaf wing on the first line to add to the back of the butterfly.
Select all the leaf wings layers and hit Ctrl+G to make a group for them. Change the mode of the group to Normal 100% and make a Hue/Saturation adjustment layer within this group.
Create a Color Balance adjustment layer to give the wings on the child redder. Paint on the wings on the butterfly to keep their color.
Make a Curves adjustment layer to brighten the upper of the leaf wings more. Paint on lower so they won't be affected by this adjustment layer.
Isolate the branch and move it into our main document. Place it onto the bottom of the flower's stem and convert it to a Smart Object.
Apply a Gaussian Blur of 9 px to this layer to increase the depth of the scene.
Create a Hue/Saturation adjustment layer to change the color and contrast of the branch.