In the beginning you should create a new document sized 1900х1200 pixels and fill it with black color.

Then I would like to bring the picture one of the heroes to our canvas. You can find different pictures on Google Images or feel free to use mine. Open up the picture and using Ctrl+C copy it , then go back to the main canvas and press Ctrl+V to paste copied fragment. Move this fragment to right lower corner.

As you can see the picture less then canvas, in this way press Ctrl+T and hold Shift button to enlarge the picture pro rata. The result should look as mine:

After increasing the image sharpness has become worse. We can fix this problem by duplicating current layer with Ctrl+J and Filter > Other > High Pass with next parameters:

After that change layer mode to Overlay and you will get the next result: