This is an excuse for fluff (no I did not want to write Monet, Manet is awesome).
Last panel : I know this goes against hetalia canon but I think Hungary, Italy and Poland are like "OMG no one wants to see this!" whenever naked!Germany comes along (which happens a lot). Austria and Czechia are vaguely supportive or indifferent because they’re used to it.
Panel 6 : Israel is no good at being charming and subtle (to put it mildly) so it’s a good thing he rarely tries. He's optimistic about being able to create blue roses though: [link]
Panel 5:Germany is either upset because he doesn’t like giant gingerbread hearts (they’re Bavarian), because he doesn’t like the text on it or because he had hoped for a more awesome gift.
The numbers about Valentine’s Day and the economy looked valid enough but I wouldn’t take them too seriously (they‘re sometimes estimates).
There’s a movie for shippers and haters of France/Belgium: [link]