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.
I would put The cookies smelled so good while they baked, I couldn't wait for them to finally be done. to me that's how I would say it and I that think how is it is said.