Tried PhotoscapeX to combine the Ireland 1813 10 pence images. Collage seems pretty straightforward. It forces you to expand an image if you rotate it to make up for the "missing" area in that orientation. So I should crop my photos less aggressively if I want to adjust the rotation later. Easier than lining the photos up and doing a screen grab, at least.
Yes, when you use it a lot it has so many functions. I like the combine with background choices, borders and text
This site works well to merge images.https://www.imgonline.com.ua/eng/combine-two-images-into-one.php