With both photos open, click [V] on your keyboard to select the move tool, and drag the 'ghost' image on top of the background image.
![ghost mannequin](/uploads/2/2/1/1/22119876/8258059_orig.jpg)
Photo of Ghost Mannequin
Then, make sure you're editing the 'ghost mannequin' image which should be the top image in the layers palette, if not, click on it to highlight and then simply go to the Adjustment and choose Desaturate on layers palette should now look something like mine below:
Once you've done that you need to erase everything from that top image (to reveal the background layer below) except for the ghost mannequin - i.e. your model.
There are two ways to do this - the easy way and another one is the hard way!
The easy way:
Choose the eraser tool (press [E] on your keyboard, get erasing! Scrub out everything except your ghost. If you go a bit wrong, press [CTRL] + [Z] to undo
And then there's the hard, but a lot more flexible, way ... but to do this you'll need a better image editor that allows layer masks to be used. Pixlr is clunky in this respect (it is free after all) and doesn't work so well.
First, add a layer mask to your top, desaturated, layer fill your layer mask with black - this has the effect of masking everything out then pick a brush, and set the color to white. Now brush merely over the model - this will bring back part of the layer mask and, in the process, bring the model back on top if it make a mistake, switch color back to the black and go over the mistake because of that black masks things are out, where white brings them back.
![Picture](/uploads/2/2/1/1/22119876/3722887_orig.jpg)
Photo of Ghost Mannequin Service
To do this you change the transparency of that layer. In Pixlr merely click on small icon in the bottom layers palette corner, then circled like red below:
A little list of options will be appear with an opacity slider on it - slide the opacity down to about half and your layer will appear partially transparent - ghost mannequin like!
Final job - flatten your image. Go to layer and choose flatten image.
And there you go - a little trick photography effect to make anyone look like a photoshop ghost mannequin service.