Customers who are impatient and don't understand how being an artist actually works. This isn't an issue specific to FurAffinity but it seems to happen to me way more often on FA than anywhere else. On DeviantArt people seem to be way more patient. It's common to get a customer, who will pay for their commission, and then will note me asking why it's not done within a couple of days. Most recently, on the same day. And they usually get super hostile when you tell them you can't work that fast :< Please, good art takes time. I try to make my art look as best as I can and that just can't be done in a few hours. I also have multiple people waiting for art. It would be unfair for me to prioritize someone who just bought a commission over someone who's been waiting for longer. Ugh. I guess it's just something I have to deal with.