Mad Scientists of Etsy (MSOE) monthly challenge - "Cretaceous Ocean"

So the April is almost over and here are the results of the monthly challenge from Mad Scientists of Etsy (MSOE). This month’s challenge was a creation inspired by the theme of "Cretaceous Ocean".

…just a little bit of mandatory nerd (= science) talk now :)

The Cretaceous was a geologic time period approximately 145 to 65 million years ago. It was a period with a relatively warm climate and high sea level. The oceans and seas were populated with now extinct marine reptiles, ammonites and rudists; and the land by dinosaurs. At the same time, new groups of mammals and birds as well as flowering plants appeared. The Cretaceous ended with one of the largest mass extinctions in Earth history, the K-T extinction, when many species, including the dinosaurs, pterosaurs, and large marine reptiles, disappeared.
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So I’ve decided to try my new acquired skills in digital drawing and create underwater scenery what could’ve been seen at that time. I’ve used my own shots of the Triops (tadpole shrimp or shield shrimp).

 
Their external morphology has not changed since around 220 million years ago, which would mean that their early relatives were much bigger but looked exactly or similar to what these little guys look today. The rest of the scenery was digitally drawn in Photoshop by yours truly :)