I know it's because the pixel art that I upload for the thumbnails specifically are the problem because they are just too small, but I just think the small thumbnail in the corner of the box is funny. For the blue one, I specifically uploaded the regular sized art thinking I could avoid tiny thumbnail again. But then tiny thumbnail again. 
I'll just make a really big one if I do another pixel face or something similar to this again.
Have you ever made a tiny thumbnail on accident? I think you did. I believe it. Do you?
EuropeanRat
You can try scaling the pixel art up :>