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Select all the knight and debris layers and press Cmd/Ctrl+G to make a group for them. Change this layer mode from Pass Through (default group mode) to Normal 100%. On the top of the layers within this group, make a Curves adjustment layer to darken the knight and the disintegration effect:
On this layer mask, use a soft black brush to refine the light and shade on the knight to fit the background. You can see the results on the layer mask and on the picture:
Use a Hue/Saturation adjustment layer to reduce the redness of the skull and other details:
To reduce the lightness on the top of the skull, make a new layer and use a soft brush with the color #958673 to paint there. Change this layer mode to Multiply 100%:
Place the fire image in the foreground and change the mode to Screen 100%. Use a layer mask to remove any white edges remained.
To add a glowing effect to the fire, make a new layer under the fire one. Use a soft brush with the color #281b01 to paint on the bottom right of the image and change the mode to Linear Dodge 100%.
Make a new layer, use a soft brush with the color #e6802d to paint on the bottom right again. Change this layer mode to Hard Light 100%.
To make the fire reflection on the knight, create a new layer under the fire and glowing light ones. Use a brush with the color #ffd10e to paint on the strokes of the knight clothes and sword. Change this layer mode to Overlay 100%:
Duplicate this layer to make the effect stronger:
Create a new layer and use a soft brush with the color #ff850e to paint more red effect. Set this layer mode to Overlay 100%.
To change the light and contrast of the image, make a new layer on the top. Active the Gradient Tool (G) and choose Radial Gradient with default colors (black and white). Drag a line from the top left to the bottom right of the canvas and change this layer mode to Soft Light 100%. Add a mask to this layer and use a soft black brush to erase the right of the fire area as I don't want it to be affected by this Gradient layer.