So many feelings flashcards use static images, which can be somewhat confusing or misleading to children. I prefer using gifs myself, they show more authentic body language...you can easily find gifs about each emotion on Giphy.
You can print these flashcards, and cut them out together. From there, you have lots of options, including:
1. Discussing times when both parent and child remembers feeling each emotion
2. Looking up gifs together and discussing them
3. Drawing pictures on the back of each card
4. Finding pictures magazines and pasting to the back