Hmm, with a weakened monarchy and probably disgraced junker class, we would probably not see that many monrchies being created in Eastern Europe. If the kaise is not sitting strong on his throne, the new nations would not be interrested in importing German princes as kings, but instead creating republics with their own leaders. Even though Germany is democratic for the moment, there is no guarantee it would hold. We probably won't see a strong communist party yet, since the revolution in Russia seems to be delayed, but the junkers who still constitute almost half of the German officers would probably be a threat towards the new system. Especially if the Germans fail to dominate the new states in Eastern Europe. Then they'd eventually come to the conclusion that they indeed have lost the war and been tricked by the government.
In the new nations of Eastern Europe things will also be unstable. In the beginning they'd pretty much lean on German support, but with a large unstable Russia, that can tilt into some kind of madness anytime the lure of dictatorship is large. Especially Poland would probably try to loosen it's bonds to Germany relatively soon and try to establish a more independent postition. Lithuania I can see staying Germany's best friend in the region, due to fear of Poland (Vilnius is Lithuanian I take). I won't take up Belarus or Ukraine since I don't know your plan for those nations yet. If they're included in the peace deal between Germany and Russia, well things could get messy.
The Austo- Hungarian nations remain interresting. You mentioned Poland annexing Galizia. Just Polish majority West Galizia or the whole Galizia including Ukrainian majority East Galizia. Anyway that would probably strengthen the Polish economy. That would also leave Bukovina as an Austrian mini Romania.
In Bohemia there would probably be some insecurity between the new Czech state apparatus and the Sudet Germans. The Austrians would probably have made sure the Sudet Germans have certain autonomous rights, that the Prague government would try to revoke. Expect tensions between Vienna and Prague over this issue.
The Magyars only losing Croatia- Salvonia would probably make sure Hungary is still the largest Habsburg supporter. Magyarization of Slovakia, Transylvania and the Banat would continue, and Serbs and Romanians would still look at Belgrade and Bucharest for support. Hungary would still be relatively stable. The Hungarian nobility would remain a strong factor, could very well see them becoming the most influential nobility in Europe, but common Magyars would be able to get their interests represented in the parliament in Budapest. This could be a Hungarian golden age.
Croatia would be the new player, created as a Catholic south slavic state, and as an counterweight to Serbian aspirations. Croatia would have a secure Croat majority, and Croatization of areas like Montenegro and Bosnia- Herzegovina would ensure. The Catholic church would be a strong tool for the building of the Croat nation. Being a Bosnian muslim would be very hard.
The Austian part of the Habsburg lands would probably see much democratization, since the Austrian Germans were more than ready for more political freedoms. I see Social Democrats and Christian Democrats as the two largest forces (unlike Germany where there probably will be tie with 7-8 parties). The awakening of Slovenian nationalism and a fear of Italian aggression would probably lead to a colonization process, where German Austrians move to the Slovenian and Italian speaking areas to Germanize them.
Balkans;
crap, since Romania and Serbia are listed losers I guess Bulgaria at least hasn't lost any territory. Has Bulgaria annexed territory from her neighbours like Macedonia from Serbia and Greece and North Dobrudja from Romania (and worst case scenario the Nis area from Serbia)?? In that case Bulgaria would be the major power of East Balkans. That would also ensure revengist Serbia, Greece and Romania, and a Bulgarian feeling of being surrounded by enemies. I don't think democracy has any other chance than being a short experiment in these countries. The Serbian monarchy might fall, what would replace it is uncertain. A military dictatorship is not out of the question. Romania, Greece and Bulgaria could all become Royalist Dictatorship. For Bulgaria that's the most probable way. In Greece there is also a chance for a military dictatorship. In Romania both a military dictatorship or a popular dictatorship featuring the OTL fascist Iron Guard is possible.