Yesterday I tried the gallery feature (thanks for the opportunity and the space for it btw). But something strange happened: I found the sixth option of image sizes in Renderosity :) And I'd like to suggest reducing the number of different sizes.

At first, which I met?
Avatar: exact 200*200
Bio Picture: width = 800px
Thumbnail for freestuff: exact 300x350 px
Images for freestuff: width = 800 ‐ 1200 px
Gallery images: Width: 500px - 6000px & Height: 350px - 6000px (JPEG only)
Thumbnail: width exact 300px, height: 200px - 500px (JPEG only)
(Maybe marketplace items require something else.)

This looks like the result of various developments in the history of this site. So it's okay. But it also seems a bit chaotic and improvised. Finally, in the page view you will also find: reduced avatars, icons, background graphics, page images, different banner sizes.

Perhaps with the many innovations, it would be a good idea to take a closer look at this as well.