1) The only way Austria is getting Lombardy back is if it's willing to fight France again. In fact, chances are Napoleon III might intervene anyway, either to force the Austrians out of Venetia (he was determined to expel them from the Italian Peninsula) or to grab a share of the Prussian Rhineland. Or maybe even to help Prussia.
2) Denmark getting back Holstein is a big no-no. The province offers the Austrians access to northern Germany, the Danes didn't really want it (their focus was on Schleswig) and giving it to them is a surefire way for Austria to insult German national feeling. Hell, even giving the Danes Schleswig is iffy.
3) Unified Hesse, Thuringia and Mecklenburg make no sense.
4) Luxembourg was Dutch. How did the Bavarians get it?
1) After Napoleon I Austria gained Venice and Lombardy 2) In sense the Danes did want Holstein look up duchy of Holstein 3) There not unified using your logic that means Prussia Belgium Italy and Baden are united see were I'm going? 4) Same sense for 3)
1) And in 1859 it lost Lombardy. This map requires that it get it back.
2) Denmark did not want Holstein. There were very few Danes there. Denmark, on the contrary, wanted to separate Schleswig from Holstein, and it was precisely this that provided a casus belli for the 1864 war. My other objections remains: Austria would lose territory and offend even the most moderate of German nationalists by giving up Holstein.
3) No, I don't. I don't have any idea what the hell you're saying, and not just because you refuse to use punctuation. Prussia, Belgium, Italy, and Baden were *countries*. On the eve of the Austro-Prussian War, there were 2 or 3 countries making up the *region* of Hesse (Hesse-Darmstadt, Hesse-Kassel and Nassau, depending on whether or not you want to count it), 8 countries making up the *region* of Thuringia (Reuss-Gera, Reuss-Greiz, Saxe-Altenburg, Saxe-Coburg-Gotha, Saxe-Meiningen, Saxe-Weimar-Eisenach, Schwarzburg-Rudolstadt, and Schwarzburg-Sondershausen), and 2 countries making up the *region* of Mecklenburg (Mecklenburg-Schwerin and Mecklenburg-Strelitz).
4) Since your answer to 3) made no sense, I ask again: How did Bavaria acquire Luxembourg, which in 1866 belonged to the Netherlands?
You could use a larger color palette and write "Small States" where appropriate. When you bother to depict Liechtenstein and San Marino on your map, it's normal to assume the other shapes are also countries.
Oh, and another thing: your Montenegro has a coastline, which it would not obtain until 1878.