Hmm, the more I look at the map, the more I think that eastern Germany and Austria-Hungary need redrawn.
1. Their boundaries look oddly mis-shapen: they need some smoothing out. Remember, these aren’t the jagged battle-lines of a mid-war situation, but boundaries that had mostly existed since 1815 here.
2. Also, Vienna and Budapest should have a more circular shape (especially Budapest: I’m guessing you just created a random territory to divide Hungary, but it looks almost like you were trying to draw a circle and messed up. With so many less-important cities getting circles, you might as well give Budapest a circle, too.)
3. If you need another division for Hungary, divide off Galicia, which is basically the slice of Poland that was awarded to Austria in the partitions.
4. Rename “Western Romania” Transylvania, which was its actual territory name at the time. The modern Kingdom of Romania had never possessed it up to this point, and its population, while majority Romanian-speaking, was probably at least 30-40% Hungarian, with a significant German minority. Naming it as you did could be seen as taking a political stance that it “ought to have been” part of Romania, which amounts to taking sides in an old Hungarian-Romanian rivalry.
5. You could also consider dividing Romania into its two principle components, Wallachia and Moldavia to make it more than a 1-province country.