As a follow up to T220145: Homepage Mentorship: allow mentors to configure their presentation, I think it would be beneficial to allow mentors to specify an image that can be used alongside their username (and custom text, if set) in Special:Homepage
Ignoring the fact that I'm not a designer and that I'm mentoring myself here, it would look something like this:
The formatting in the mentors list would be something like:
[[User:KHarlan_(WMF)]]|Some custom text|Image name # User without custom text, but with image [[User:KHarlan_(WMF)]]||Image name # User with custom text, but without image [[User:KHarlan_(WMF)]]|Some custom text
It would also be nice to load the image into the mentorship help module after you've clicked "ask a question", as a way to make the process friendlier and more welcoming to new users.