I printed this on paper and tried the “arm’s length” test, which this poster passes, but only just by the skin of the teeth. The text is readable, but just barely. Bigger text would be very welcome here.
The text in the lower right box (beginning with “N”) comes too close to the edge of the box, particularly down in the lower left corner.
While we’re looking down at the bottom, another part of the poster that is a problem is inconsistent margins between the boxes. In particular, the bottom of the right column doesn’t line up with the bottom of the left column. Here’s a quick and dirty aligned version that doesn’t set off my alignment OCD as much:
I needed a coloured background to show up my molecules so I tried to go for a neutral colour that also ties in with my university colours.
Unfortunately, the colour choice for the background is still a problem. The blue and the grey molecules are too close, and the molecules are getting lost at any sort of distance. The following quick and dirty colour replacement grates on the eye a bit:
I show this just to demonstrate that the pictures of molecular structure are much more readily visible against a lighter background. Those molecules are the whole point of the poster, and it would help if they were more visible than they are here.
Is it big enough? The “arm’s length” test