This Sea Turtle poster is by Desi Potts. The round letters she used looks really sharp! Below is a close-up.
The next one is by Corrinne Rivera. Did you know that the starfish doesn't have a brain? Maybe that's why they made the Patrick Starfish character on Sponge-Bob act so silly!
The Leatherback Sea Turtle poster is by Brooke Rees. She used sandpaper on the bottom of the poster to simulate sand.
Here's a close-up of Brooke's poster. She even glued real sea shells to the sand! And look at the sea weed shapes she cut from paper.