Hi Bei,

Apologies for not getting back to you sooner—I realize that the deadline for the application is today. There are a very large number of data sets about emotion, which have been used extensively for tasks like emotion detection and sentiment analysis in text and images. This paper has a good overview of emotion detection approaches for text:

https://onlinelibrary.wiley.com/doi/full/10.1002/eng2.12189

A simple approach is implemented in this Python library, which uses a keyword corpus associated with particular emotional valences:

https://github.com/cjhutto/vaderSentiment

An interesting dataset for emotion detection in images is Emotic:

http://sunai.uoc.edu/emotic/index.html

This library associating colors with emotions may also be of interest:

https://github.com/josh-ashkinaze/emotapal

Hope this helps, and good luck with the proposal!

Best, Allison