I used to use Twitter as my profile host back in December or January. I'm not saying it doesn't work, but I feel that telling people to use Twitter as their image host is a bad idea.
Discussion
people want more control over their pfps, and nostr build doesn’t do that without signing up and paying for an account in bitcoin, that’s not normie friendly
You can try nostrcheck.me or install your own nostrcheck instance. You can control your avatar and banner with the free tier.