There are plenty of excellent artists out there. If your video games inspire them, you can have a large fan-base who can contribute fanworks... from (amateur) manga/comics and other online works, to fan art, and maybe even some professionals remixing your works (most noticeably in the music world for Zun, where professionals / dedicated musicians take his speedy tunes and add a more subtle flair to it)

The "Bad Apple" fanwork is a great example of how the fan community interacted with Zun (https://www.youtube.com/watch?v=UkgK8eUdpAo). The shadow art was its own thing (though clearly based on Zun's characters / Touhou characters), but the song itself was a remix based from an earlier game (https://www.youtube.com/watch?v=xNKyPkQ-_ug)... and professional level remixes to Bad Apple have entered the world.

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So Zun was "good enough" at art, music, and programming... but also did a great job at inspiring and leading the Touhou community / fanbase.

In many ways, the "game designer as commmunity leader" model is apparent. Braid, Touhou, Minecraft, and even Factorio all had community leaders and fan-growth that was superbly done.

The music / art of the Touhou community though really elevates that particular community into true artistry. Both of the classic kind (just straight up good drawings / music being made), as well as of the programming / interactive kind.