Old B&W Photo Re-touching

I'm trying to restore my Nana and Grandad's wedding photo. As you can probably tell the image I've got was taken with the photo still in the frame hence the reflections, unevenness etc, I'd appreciate help in how to correct this. Feel free to edit and post results if you can help.

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Here's a quick and dirty correction. Duplicate the background layer and set the blending mode to Multiply. Now hold down the Option/Alt key and click on the layer mask creating a layer mask filled with black. Now use a white brush paint over the image where you want to darker image to show through the mask. I used varying brush opacities to control how strongly the darker images shows. It pushes the dark tones of the uniform down into the blacks, but you might be able to bring them up a bit in a curves adjustment layer.

If you have a chance to reshoot it, you can cut a hole in a large black cardboard and shoot through the hole, which will eliminate most of the glare and reflection from the frame glass.

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Is this the only size of the image you have? To be honest, it feels pointless to put down some work on a small screen sized image. I rather work on a full res, to make it worth my while. This image is easy to salvage, I've seen way worse!

Off course in this digital age CICO still applies.... It might be worth the effort to get a decent reproduction or scan to start off with

chtgrubbs, many thanks for the tip, brilliant. I'll give it a go on the full res image.

CyberPet, if you are willing to give it a go the full res image is here

Unfortunately the original photo is partially stuck to the glass and there's obviously no way I'd risk damaging it. Original is also 300 miles away now so little chance of re-shooting it.

The flare is a problem, so you might need to find a lighting situation where you can avoid it as much as possible, if you cannot remove the glass.

Now I made it a pretty hard contrast to remove the glare, with some cloning as well. I was working in sRGB space, so it will look a bit different in colors than our aRGB.

Here's a preview of the result - which I could work more with it some more if I wasn't so tired right now.

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Petra, I really can't thank you enough Grandad hasn't long left to live so there's a alot of sentimental value in this photo.

You're welcome!