Based on feedback, my future uploads will be lossless pngs.

https://imgur.com/a/5vmIELH

Here is a side-by-side comparison of a zoomed and cropped section of one of my images, so you can judge for yourself. Png files are about 3-4 times larger than high quality jpeg files, but I think the jpeg artifacts are noticeable, particularly on my linework or red parts of the image.

I appreciate everyone's feedback yesterday, thanks for being patient with me!