Hi!
You can first create the table than using your browser inspect the elements of the table. The table will surely have some unique id and classes. Use that id and classes in your CSS to change the relative size of the table.
I had not tried images in table. You can check dash bootstrap components dbc (https://dash-bootstrap-components.opensource.faculty.ai/docs/components/table/). I guess it supports images. I would suggest if you don’t have much priority for markdown style and want to focus more on images than try dbc.
Thanks!