Depends on the scale of victory.
Total German Victory:
Germany annexes Briey-Longwy, Belfort, the western slopes of the Vosges, and Luxembourg. Belgium is puppetized to Germany, and has Nord-Pas-de-Calais annexed to it. German naval bases are established in Calais and Antwerp. In the East, Brest-Litovsk holds, with Estonia and Latvia united into a United Baltic Duchy tied heavily to Germany, ruled by a Baltic German nobility. If A-H collapses, Germany gobbles up Austria and Bohemia, West Galicia goes to Poland, East Galicia to Ukraine, and independent states for everyone else. All the new states, as well as Belgium, as well as the Nordic countries probably, join the German Zollverein, re-established as a Mitteleuropa economic bloc. Germany annexes the Congo, French Cameroon, and establishes a Mittelafrika German super-colony.
Narrow German Victory:
You get Brest-Litovsk or B-L minus the Ukraine in the East, while Germany makes minor annexations in the West, probably consisting of Briey-Longwy (quite easily not), Belfort, and Luxembourg. Belgium is independent, and after the war, tied far closer to the Entente states than before, and Germany gives some colonies to Britain to get her out of the war.
Close German "Victory":
Germany gets minor gains from the West, such as Luxembourg, or if she gets a Brest-Litovsk (or B-L minus the Ukraine) in the East, then nothing in the West. Germany loses all her colonies. Posen is possibly lost to Poland.