Create an unfinished piece (not fully coloured) of a hero on shore leave.  The hero can be doing whatever activity you think they may part take of on their day off.  The image must include a piece of evidence showing what they do in real life, e.g. weapons, newspapers.

I decided to create a light watercolour vignette.  The Invisible Woman is surrounded by colour while she remains blank/invisible.  As her mark as who she is in real life I chose to have her drinking a beer with the Fantastic Four emblem on it.