i concur, its possible that someone grabbed a stock and added a bit of lighting to it, then post it. thats why i would like to see what he did to it and not what the original artist did.
**EDIT** With the iron man sig all you really did was smudge the bg and add a little bit of lighting. Add some more effects into the bg and atm it looks as if you have 3 focals. I suggest you dim the lighting on the left hand and chest and keep the full focal on the right hand. Also you can add some better lighting by applying the image on new layer, filter>stylize>glowing edges using 1, 11, 15 respectively. Then filter>blur>radial blur and set it to about 70 Zoom and offset the zoom to where you lighting is coming from, then lower the opacity to about 60ish and set it to screen. It will add a nice light source to it