Recommendation: do not use an A.I.-generated image. Many see those as a sign of laziness, and they can stick out like a sore thumb.
You don't need to use a selfie, though, if you're not comfortable sharing your face on the web. Consider a picture of a pet, a local flower, or art you made.
For example, my image started as a photo for an on-chain contest years ago, and I used Canva to draw over the photo to create my current avatar image. I have use it in one form or another since before HIVE was called HIVE.
Thanks for suggestion! Images are relevant to post and its context, feature. We will think of ways to improve those, thumbnails are generally not main content here, text is because we talk about features and guides that many might have missed.
I was referring to profile pictures and avatars, not your post image.