Duplicate the Background layer. You can do this by selecting the Background layer then pressing Ctrl+J (Cmd+J on a Mac). Drag this layer to the top then change the blending mode to Overlay.
Create a new layer and position it as the top layer. Name this layer “Glow”.
Use the Lasso selection tool to create a selection of the cave like shown in the image below.
Fill the selected area with white (Edit > Fill). Then, press Ctrl+D or Cmd+D to deselect the selection.
Go to Filter > Blur > Radial Blur. Use the settings shown below.
Your blur should look like this. If it doesn’t, undo and try the Radial Blur filter again using a different Blur Center setting.
Next, open the image of the silhouette.
We’re going to make a selection of it. Select the Magic Wand tool to make a selection like shown in the image below. Your Magic Wand tool should have a Tolerance setting of 32 – you can adjust this in the option bar located at the top of your Photoshop interface.
Go to Edit > Copy. Close the image then switch back to the original Photoshop document we were working on. Go to Edit > Paste and Photoshop will paste the silhouette as a new layer.
Use the Eraser tool to erase the excess area around the man.
Go to Edit > Free Transform. Shrink and position the man like this:
Go to Image > Adjustments > Shadows/Highlights. Set the Amount to 100%. This will reveal some details in the silhouette.
Add another Hue/Saturation layer by going to Layer > New Adjustment Layer > Hue/Saturation. Change the blending mode to Soft Light.
In the Adjustments panel, adjust the settings like this. Remember to checkmark the Colorize option first.
Here’s what it looks like with the color adjustment.