From the project files (registration required), open the model shot (model.jpg) in Photoshop. We want to remove her from the background, and the best way to do this is to mask her out, then invert the mask to select just her. Using the Magic Wand tool with a Tolerance of 30, select the background by clicking a couple of times and holding Shift so you can add to the selection. Also select the area of her chest that’s visible.
To fix details around the pearls and flowers, turn on Quick Mask Mode (Q) and, using a brush, fill in the areas that should be part of your mask. Turn off Quick Mask Mode, then go to Select > Inverse Selection (Cmd/Ctrl + Shift + I). Copy and paste the model into your main composition.