In all likelihood, that is just a scammer and not an actual artist. Hence why they were so aggressive with trying to get your money immediately, especially after trying to solicit you to commission them. Such a solicitation is also a red flag that it is a scam. The art you seen was probably stolen.
They don't care if you're short on money. They want the last bit of cash you can scrounge so they can take it and run. I recall encountering plenty of scammers with the exact same MO on discord.