Step 18

Group all the branch layers into one group (Hold Shift and Left Click on the branch layer at the top then click the branch layer at the bottom of the list to select all of them, Ctrl + G to group). Apply these adjustment layers to the group.

Brightness/Contrast -> Curves

Also we want some extra shadow on those branches so create a new layer, Create Clipping Mask with the group and paint some black on the branches.

Change the Blend Mode to Soft Light, Opacity 47%

Step 19

Create more shadow at the bottom of the model and the branches on the ground with Black soft brush.

Opacity 45%

Step 20

We had fun with the branches, now its time to have fun with ivies. Open the Ivy stock which has been rendered nicely for you to use. Place it behind the model.

Place more and transform them as your will as well. The more the merrier! Make them follow the branches.

Step 21

Add this Hue/Saturation adjustment layer to the ivies. Group them into one before doing this!

Our result so far.

Step 22

Bring more ivies to the front of the model and make them follow the branches on her body.

Step 23

Similar with step 21, add a Hue/Saturation adjustment layer to all the ivies at the front.