Answer:
Her interest in nature
Explanation:
The creatures aren't drawn to look particularly beautiful, and neither is Frida Kahlo (not to say she isn't; it just clearly was not drawn with beauty as the subject). Her interest in nature was and is well known.
If you're looking for what they are.
Junius Brutus was the founder of the Roman Republic and Julius Caesar was a historian roman politician and a general too.
Hope this helped