It is mandatory to check "remove color" box inside the refine edge tool and to increase the efficiency of it, otherwise the lace will be greenish.
step 3 of 10
Move the dress to the target picture, scale and transform it to fit the model
step 4 of 10
Hands should be seen, so select them and copy to a new layer
step 5 of 10
Move hands with flowers to the desirable place, erase parts that should be hidden under the dress (40% eraser opacity)
step 6 of 10
Copy the dress from the source once more, flip it horizontally and transform to fit the second girl
step 7 of 10
I want the long hair to be seen, so make them visible by using archive brush (50% opacity)
step 8 of 10
Girls hate when someone wears same dress, so need to change the ribbon color. Select the ribbon and part of the dress, then go image - hue/saturation, make it red
step 9 of 10
Need to check the whole picture, use burn and dodge tools to make it look more real. One shoulder looks weird, so I will cover it with the lace
step 10 of 10
Original picture has grain effect, so do filters - grain with low numbers of size and intensity.