So I've been working on this for most of the summer on and off. I wanted to make a couple of poster ideas based around the dramatic use of lighting. The two best ideas I came up with were for Ironman and Thor, ergo the Marvel theme.
I made the Ironman poster into the wallpaper above
So by using reference images I was able to recreate parts of the armour and using gradients and the opacity tool I was able to create the effect that it was all lit by the lighting. I experimented with colouring the armour panels, but I preferred the grey scale version.
But I felt it was still lacking punch so I darkened the background to further emphasise the lighting.
I then adjusted the opacity of the various elements to create the lighting effect. For the eyes and the cloak, as they are such iconic parts of the Thor imagery I gave them colour to make them stand out.