This is an interesting scenario and a very nice map. However, I'd like to offer some suggestions.
About Ukraine, Ukraine's IOLT Gov't would a German supported Dictatorship, the Hetmanate of Pablo Skoropadsky, however, with the war going on longer it is reasonable to expect a few things, one of them, expansion, the Kuban Peninsula, Crimea, and at least part of Bukovina. The Kuban tried to join Ukraine IOTL in 1918 and Crimea did, along with the Black Sea Fleet which was at the time majority Ukrainian. Tsarist Crimea would be unsustainable because they'd be surrounded by a hostile Ukraine and Turkey (across the sea controlling trade and access). Bukovina being independent is kind of odd. Germans could be respected in Romania because they've got a Hohenzollern King. The northern part would likely go to Ukraine since in 1918 they did try and join the ZUNR IOTL.
It would be interesting to see how Ukraine interacts with the world with no truly dominant blocs in central or eastern Europe and to see if Ukraine becomes a regional power trying to create an anti-Bolshevik intermarium with Belarus and the Baltic States, excluding Poland, obviously since they'd be mad about Galicia.
If you need any help on Ukraine info or background I've got some nice books and would be happy to grab some quotes or maps if you need any help.
This is a super interesting scenario and I really like your map.