Drawings like this that contain subliminal messages are designed to achieve perception without awareness. It would have been too "on the nose" if they'd have shown the DF'd person in black and white and the JW's in color.
In this case they wanted to draw the viewers eye to the sad and questionably dressed woman who appears to be the process of turning her back on the loving congregation and having second thoughts about sadly heading out into the world alone. Her form fitting bright colored sleeveless dress and high heel shoes compared to the loose fitting clothes of the others give the indication that she has been influenced by the wicked world. Her grey book bag and sad expression shows that kingdom interests have become secondary, she knows she is in the wrong and is about to make a mistake she will regret.
Subliminal messages are most effective when the are negative and induce a fear response on a subconscious level. Advertisers and JW's must resort to these tactics when what they have to offer isn't able to stand alone on it's own merit and their target audience has to be swayed into a mindset that causes them to do or think what they normally wouldn't have on their own.
Too bad Gods "spirit directed organization" has such little confidence in the message of the Bible and in Jehovah's spirit to be able to draw people to him without resorting to trickery.