Content on this page may not be up to date. Some images I like, mostly photographs, are at User:Ilzolende/favorites.
I'm currently into SVG heraldry. Specifically, I'm interested in categorizing things and filling out Category:SVG coat of arms elements - charges, usually with charges extracted from extant arms. My experience is that COA sourcing metadata often isn't present and people will copy and paste charges without attribution. Given this, I try to find the oldest occurrence of any given depiction of a charge and treat it as the original. However, I may be wrong about this. If you have better sourcing for any of my uploads, please correct me!
I think it's valuable to try to find the original instance of a heraldic charge, or at least an early instance, because often errors and cruft accumulate as charges are copied between shields, and chains of attribution get chaotic. (I've seen a lot of shields with gradients they never use in the definitions, and a lot of charges where the original author used detail lines with no fill that then received inappropriate fills, as well as excess matrix transformations.)
I currently attribute extracted charges to the original creator (if I identify them!) in the author/artist field, which people citing the charge use, but list myself in the SVG development field. If I make a lot of changes, I might also list myself as creating a derivative work in the author/artist field. If I've extracted a charge from your work, and you'd like to be listed in the SVG development field, please feel free to edit and let me know so I can list you going forward.
I often give my uploads somewhat arbitrary names in hopes of easing future disambiguation.
Also, I sometimes bring in SVG images from publicdomainq.net, and I think more people should consider doing the same. Yes, the site's images are tagged only in Japanese, and it appears to require you to complete a quiz before you can download an image. However, with Wiktionary as a translation tool, searching the site becomes not that difficult. Additionally, you can just select every quiz answer until you get the right one. The downloads are Illustrator or EPS but can be converted to SVG in Inkscape. (I do recommend removing clip paths, making transforms be round numbers, and maybe removing unnecessary styling, but you can likely get away with not doing that.)