Creating snake tongue woman with dramatic effects

Start by opening an image of a model.
Duplicate the layer. Press Ctrl+U to open hue/saturation window. Apply settings as shown.

Change the layer mode to "Screen". Select and merge both the layers.
Create snake's tongue shape using pen tool.
Double click the layer to open layer style window. Apply settings as shown.

Create selection of upper lips using polygon lasso tool.
Press Ctrl+J to copy paste the selection in a new layer. Move this layer above all the layers in layer order in layer palette.

 

Create a selection as shown below using lasso tool. Create a new layer and fill it with black color. Move this layer below the tongue layer in layer order in layer palette.
Create selection of eyeball using polygon lasso tool.
Create a new layer and fill it with yellow to black gradient in radial mode.
Change the layer mode to "Color Dodge".
Repeat the above mentioned steps for the other eye.
Select dodge tool and apply this tool on hair area to create shining over it.