Most of my writings and artwork previous to 2017 are not online due to quality concerns, irrelevancy or redundancy, difficulty in maintenance, or changing social conditions.
Most my pictures are now online in WebP format in e-books due to a combination of supporting people who have trouble seeing better, lack of support for better compression in PDFs, that my pictures look bad in JPEG format, and my ISP not allowing bigger uploads. The WebP format is unusual in an EPUB.
The sources are still completely vector, so I can still change the formats over time. Most of the graphics on the web pages are still in vector format (as you see them) and I will try to find a way to include at least a vector option in the future, if and when technology allows.