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> As far as I can tell right now, he hadn't left any depictions of his vision, but written description he did
Tsiolkovsky had plenty of drawings, but they are mostly schematic - he wasn't illustrator but mostly a philosopher (stereotypical Russian Cosmist of late XIX, like Fyodorov but less crazy).
But that drawing looks more modern, I think even 1950+, and there may be multiple sources of inspirations. I guess it is from numerous of space-related books that are already forgotten, so it isn't easy to find.