Generating Ideas

I have found the universes of Warhammer and Warhammer 40k tabletop games a useful place to find examples of aesthetically similar ecosystem. The various races resemble one another, shearing features

Example: Kroot

Kroot

Kroot Hound

Krootox

Knarloc

To denote that they have all evolved in the same ecosystem, the factions of a Kroot army all have the same beak with a strong lower jaw, and spine like hair protruding from the back of the heads. they also all seem to share high, and defined cheek bones and sunken eyes. These attributes are enough of a visual link to show their shared evolution or dna. the human brain is particularly adept at picking up on repetition, design like this plays to that, i hope to use this project learn how to make design decisions in this way.