Here is a quick how-to with images!

Install:
These are replacer portraits, meaning you'll have to overwrite the original portraits for these to work. I do not have the time or know-how to make them into [CP] files, I am sorry!
1. Ensure you have all the required mods for the NPC and for the portraits to function.
2. Download the portrait mod .zip file.
3. Open the .zip file and move the contents to your Stardew Valley mods.
4. Locate where you are storing the original NPC/expansion mods and move the contents from my mod there.
5. Overwrite and enjoy!

https://imgur.com/a/0MDRTWv