How to brighten this dark picture?

I took this picture with my iPhone outside with my iPhone when it was dark. I tried using flash and it still wouldn't make it any brighter. Can anyone help me? Here is the link to the picture:
image

There's nothing there to brighten

All the area that is black has NO data, so can't be improved at all.

How far away were you from the subject when you tried to use flash?

Usually the flashes on a cell phone do not reach past about 33m (9 feet)

Use a flashlight -.

Check settings for phone app later, very blue channel, even for dark image, something wrong with image,
also noting size and quality not quality original, try finding and using original, as copy,
then adjust rgb levels and exposure,
may need to edit as black and white desaturated as color channels seem altered,
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Sagelight Lightbox Free version
http://www.sagelighteditor.com/downloadfree2.html.

image

There's about 99% nothing available to lighten/brighten. You may as well try to un-scramble a scrambled egg.

I suggest reading the Owner's Manual for your phone and see what it says about using the camera and flash.