There's quite a few ways to do this. Here's one of them!
s t e p - o n e :
Open Pixlr. Choose whatever your background is going to be. Then layer on your person. For this method, you're going to need to have a person that's cut out - whether it be manually or a transparent/PNG. If you want a white glow, make your background darker so it'll easily show up.
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s t e p - t w o :
Right click on the person layer and press "Duplicate layer".
s t e p - t h r e e :
It should say that it's a copy. Find that layer and drag it so that it is below the original layer.
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s t e p - f o u r :
Make sure you are still on the layer copy. Go up to "Adjustment" and click on "Brightness & Contrast..."
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s t e p - f i v e :
Drag the Contrast button all the way to the left. The number should be -100. Press OK.
