"The Baal fifty" is a high score table that contains the top scorers and they are often be used for greetings or secret messages and this one doesn't seem to be an exception.
The work in progress is interesting as it shows several changes to the final image from the game.
Roger's head and left hand was changed, as was the expression in his face.
If you look closely it is also visible that the copyright message was moved from the center left side to the lower left side, since the text was colored black instead of removing it properly from the brick wall.
The small artifacts scattered around the brick wall are mostly my fault, because I had to reconstruct the wip image from a badly rescaled version that I found on the internet.