WW2 poster

This poster uses mostly the official US navy colors. It helps the user to identify this as a militaristic poster, specifically for the navy without even having to look at the images.

The smoke in this poster is very cartoonish. The artist has given the smoke a solid form instead of it's typical ethereal quality. The sub is also very simplified, having only 1 color and no depth to it so it looks rather flat. The artist also gave the sub a shark face to help with the idea of the unseen predator of the deep coming to attack. The battleship/destroyer on the horizon is also very simplified and flat just like the sub.

The purpose of this poster is to warn against ships using smock stacks (I'm assuming steam power) as it's a good way to get attacked. The exaggerated huge area of smoke is one way the artist does this. The shark face on the sub also helps with the idea of the unseen predator of the deep which is basically what a sub is.