You want it frank? The outlines are inherently ugly and do not seem to correspond to any particular standard other than recentism. Norway, Sweden and Ireland were firmly, 100% integral parts of the Kingdom of Denmark-Norway, the Kingdom of Sweden and the United Kingdom of England, Scotland and Ireland, respectively, and should not be separate colors. To give them separate colors is to lend far too much credence to the fact that they are independent today; they were not vassals, they were part of the nations.
If the outlines are to be used, it should be for vassal states only, which would leave the Ottoman states outlined and combine all of the rest of the outlined states into single entities. This seems somewhat unfortunate, given that, for example, the Netherlands and the UK would part ways only a few years later, but perhaps those two could be separate colors with the same ruler (given that it was well-known that they would cease to be united once William III died). The same is true of Saxony and Poland-Lithuania.