This is what I do, but there are other ways to add images.
Marp comes with three themes
---
marp: true
math: mathjax
theme: default
---
Marp supports HTML! So you can embed HTML things in it
It would also stand to reason that you can create a .css file to change the look of your Marp presentation
Feel free to use AI to prompt it to make you a separate .css file for a marp presentation
{
"markdown.marp.themes": [
"./theme1.css",
"./theme2.css"
]
}
these are speaker notes so when you present, you can see this!
it's also possible to use an https URL
bg makes the image a background otherwise images are like  You would have to adjust the position and size somehow