Here's the article about the Kingdom of Serbia. I consider reworking it a bit, so if you have any criticism share it, I would really appreciate your participation!
Very interesting.
Did the Romanovs marry into an existing Serbian royal family (in which case, Karađorđević or Obrenović?) or was it something different? If they did marry in, when? Before or after fleeing Russia?
Also, a note on Monarchs' names: Are these some sort of English transliteration, though then why wouldn't Ioann be John or Ivan? If these are meant to be the names used by their Serbian subject i have some nitpicks. Helelna exists in Serbian but Jelena is more common still though, there's nothing wrong with it, it's the king that I have questions about. Why doesn't the King Consort, Ioann, go by Ivan or Jovan. I know that Russian czars have used the Greek spelling in the past, but IDK whether the Serbs would. It was common IOTL for foreign-born royal consorts or monarchs to change their name to the local variant. So, yeah, there is that, but those are minor details and maybe things are just different ITTL.
Other than that, I'm loving the relatively blessed Serbia. It's big, but not oppressive, and minority rights seem decent unless this article is biased in some way. The decentralization seems to indicate that regional rights are actually being respected though. Sarajevo as a second city and intellectual center kind of fits nicely. Using the endonym Beograd rather than the exonym Belgrade is also a very nice touch.
Were non-Serbs excluded from attaining higher political offices legally before or just due to social prejudices like viewing Bosniaks as "more akin to Turks" on account of them being Muslim, or was it just because there wasn't a lot of non-Serbs other than Macedonians prior to the Treaty of Neuchatel (TTLs Versailles I assume)?
How are the Macedonians treated?
All in all, great article.