Smaller photos? Side by side rectangle photos?

I would like the photo grids improved. I'd like to be able to have smaller photos in Rise, side by side photos that are not square, and photos that are centered. Until additional features are added, are there any workarounds for any of these issues?

4 Column grid: I often want my photos small, the size of the 4 column grid. When I delete any photos, it automatically left aligns. How can I make the photos centered? When I switch to a 2 or 3 column grid, the photos are huge. The only workaround I can think of is to insert a plain white square into the 1st and 4th image, but it wouldn't work for 3 photos and its extra work.

Is there a way to do non-square images side-by side? I often want to compare photos that are rectangle side-by-side. I could edit the images to have extra space, but its extra work, and I think would have image quality issues.

Example: Three full body images, centered (rectangle, not square) of people side by side in an image gallery. Underneath each person, the caption has their title and a description of their uniform. I don't want to do a gallery in these instances because the learner needs a side by side comparison.