And yes, the logo is AI, You can not really represent a plugin in a picture.
Well this is where creativity and problem solving comes in 
Just some advice on the marketing front: what you’ve done there is called “drawing the fire” or “unforced error”. By attempting to “get ahead” of a possibly negative detail that most people might have ignored, you’ve effectively shined a spotlight on it.
In writing (though the concept applies in marketing and general communication/interfacing with your community), “lampshading” is calling attention to an improbable element to show that the author is in on the joke. In marketing, if done poorly, it backfires. Instead of coming across as transparent it feels like an admission of a lack of effort or resources, followed by a weak excuse.
You see this a lot with indie developers/creators, or people new to sharing resources. I like to bring this stuff up and share some foundational wisdom: yeah just don’t do that. By pre-emptively being defensive, what you really do is put a spotlight on the very thing many would have not noticed or otherwise ignored. You open the door for criticism from those that wouldn’t ignore it, and finally you show that you are in fact aware of your choice to use AI might be taboo, but chose to do it anyway rather than use some CC0 resources or even spend 5 minutes making some derpy developer art. It also brings into question stuff like “Oh, they must have been called out for this before. Is this is a common choice they make, and they are pretending to actually care? Isn’t that dishonest? Not sure I trust their resources, if they can’t even handle a thumbnail…”
This is all food for thought, on a small facet of this domain that many newcomers never get insight from old farts with experience about, or haven’t learned the hard way by going through it and having paid attention (spoiler: most people don’t pay attention to this sort of stuff).
Keep up the good work, make good and high quality resources, and stay honest. That’ll be enough, and ultimately should be what you care about. Giving your users/customer good and honest product. The marketing and fluff will grow and evolve naturally, and if you’re an indie/lone-wolf, prioritizing the actual product versus the thumbnail/logo shows you care about it, and not the stupid flashy shiny logo to sucker people into buying garbage.