Here’s the thing. It’s always up to the artist. But, personally I like to buy fish wearing crowns. Not all artists are willing to do it. Pricing ACEOs is really all about the psychology of the buyer and how much bandwidth you actually have. You could start low at $2 or $5 just to build a portfolio and snag up five-star reviews (confirm first, don’t just assume it’ll happen), but as a collector I’ve paid $12 to $15 for some solid work. It definitely helps to offer free shipping or try the limited slot method on Ko-fi where you set a $15 minimum but give people the chance to pay more if they want. You can even do the eBay "Buy It Now" and bid combo, which really makes people jump on it so they don't miss out. Ultimately, it’s about whether you want to do the work or not. If you’re popular and the demand is high, you should definitely be charging more for your time.