I don't know if Flare wants it minimalist, but I think that exact thing but without the gas mask would look almost exactly like a real propaganda poster. At the very least, it looks like a flag. But throw on some stereotypical "fight the power" Russian-lettered message, and it'd be a flier.

Although I personally think the minimalist approach without the text would look better (less like it was trying to pack too much into too small a space; as a sig, it can't contain as much as the M&Ms poster).