Does anyone have any advice for good story thumbnails for FA? I need to make sure that when the thumbnail is so small, the text is still clearly legible.

For the first story I uploaded with a custom thumbnail, "Baby Daddy Sile", I made it 900 x 900 pixels (knowing it would be scaled down to some extend), but now all the text I included is super blurry. I can't find any concrete information on a smaller starting size thumbnails could/should be so that they aren't made so illegible when uploaded. Some say 200 x 200, some say 500 x 500. It's very confusing.

I guess it's also a learning moment that I shouldn't stuff so many tags into a thumbnail just to catch people's attention, and should stick to the bare basics.

Man, very embarrassing and frustrating for my first good story upload.