add more images to presets

[Loonyspirit]

im new to Linux and am just doing this for fun and customization and stuff but i want to add more images to the already set to the terminal but im not sure how to do it cause if i add a image to the file it just shows the home screen. and when i go to the config it says its source is ""$(fastfetch.sh logo)"", and im nit sure what to do any help is appreciated i just cant find anything thank you kind internet people