These three books cowritten by Becca Puglisi and Angela Ackman have been so useful to me. They have a whole series of these and I’m sure they’re all awesome!
The Emotional Wound Thesaurus: A Writer’s Guide to Psychological Trauma
The Emotion Thesaurus: A Writer’s Guide to Character Expression
I have the Kindle version of these three which is helpful for referring to when I can’t figure out how to describe what I’m looking for. The search function is great!
Tricks to Writing Descriptions in First-Person POV
I found this before and after comparison quite useful for my own purposes. Maybe you will, too!
How to Write Emotion Effectively
This post was published under Ava Jae, but the author’s name is now Gabe and they are AWESOME. Go check out their blog and their books! You’ll learn a lot!