Heh, I wanted to create a quick reply, but this quickly became really complicated.
Because what constitutes "pictures", "drawn" and "our members" may be subjective, particularly in this context.
Anyway, here goes... Assuming...
electronic drawings (= pictures; source, another) created from scratch count (seeing you mention "edited screenshots" (emphasis mine) as not counting)
...and, for some of the examples below, also assuming...
- small pixel art incorporated in a bigger non-original surface count (because the small work could be shared stand-alone), and
- "our members" includes forum members who only joined - and participated - briefly merely to share their original content count
...then:
Some of our mods have pictures drawn from scratch.
Examples:
- portion of my mods (ex, ex; I particularly like the idea of my Micro Palace palace chomper(*))
- this by ecco (if he created that)
- this by Dark77
- this by jeminacek
- this by hellgenocid (semi-original, I guess)
Etc.
In addition, a bunch of small, mostly 'interface'-related, drawings were probably made for PoP software/docs/videos/websites.
(*)