What you will need
Preview of final results
Create a new document with dimensions; 1600 x 1100px. First change the foreground color to a bright reddish color, the exact color doesn’t matter then hit Alt+Backspace to fill the background layer red. Paste the image with the model into your document then scale and move it until it looks like the image below.
Now we need to mask out the girl, this is usually the most tedious part of any photo manipulation but it needs to be done so you may as well get good at it. If you really can’t be bothered masking it then you can download the masked image as a PSD file here then just skip on to step 5, otherwise lets start masking. The method I use is quite complicated, first select the pen tool then look at the main toolbar and you will see three small buttons at the left, select the middle one which should say paths if you hover over it. Now start tracing round the edge of the girl, don’t worry too much about being accurate as we will be putting her on a black background later. Also don’t go round her hair, just draw round it without going near it. After you’ve got all the way round her and closed your path. Next right click somewhere in the document and select Create vector mask, this will get your image looking something like the one below.
Now change the foreground color to black or just hit D then select the background layer and hit Alt+Backspace to fill it black. You’ll notice that there will be some thin white bits around the model. So select the layer with the girl on it then click the layer mask button at the bottom of the layers panel. Now select the brush tool and choose a soft round brush about 50px diameter and 50% opacity and make sure the foreground color is still black. Now just draw over the white patches just to blend the black of her clothes into the background. After you’ve done this do the hair but change the brush opacity to 100% then just roughly blend the hair into the background. After fiddling with it for a while you should have a result like below.
Now depending on what version of Photoshop you have will dictate what you do in this step, If you have CS3 or above then just right click on the girl’s layer and select Convert to smart object. Any other version below CS3; then select the girls layer then create a new layer then hit Ctrl+E and when the dialog box comes up select apply. Now I scaled this layer slightly and move it a bit too then added another layer mask and used the same technique as in the last step to blend the model into the background, this is optional and only do it if you think your image needs to be blended more. If you got stuck at all then just go and download the PSD file I mentioned in step 2.
Duplicate the girl’s layer (Ctrl+J) then scale it up a bit then in the layers panel move this layer below the original layer. Now change the opacity of this new layer to about 10%.