Yes the creator chooses

the ordering and clients should

display them as such

This haiku was found in the wild by npub1halkcws4lz49fdcznckk9unhsfh8yd6n6n7cnl68alkej7qptmxqjk60zq

Read the origin of this art: https://njump.me/062576eb3286ad60cb0ed08e189b1bf86d3470a3ce846a449ecd7d597142867e

Also would be interesting to choose ordering, and then any events not listed would then go below as a reverse chron. Effectively adds "featured post" or "highlighted posts" to a Nostr npub.