I followed the tutorial Halo (link underneath) using the resources supplied, firstly adding the clouds and ground layer, distorting, blending and fitting them to the image size. I added a city background and a large moon with brushes from my own resources.
Next was the halo soldier layer and this was the longest part of the tutorial, cutting them out, good practice I suppose, but ....... a bit annoying. When I'm learning from a tutorial, I would prefer to have the resources already prepared.
Anyway, after that I added the last cloud layer giving it a lovely orange glow and added more lighting, an overlay of one of my fractals then added two light sources to enhance and amplify the obvious existing light source.
Here is my result.