It would be better, if they opt for something everyone knows.
Perhaps, some of the EU buildings ? Like the Court of Justice of the European Union (CJEU), the European Central Bank (ECB) , the Strasbourg building seat of the European Parliament, etc…
Also, since they are leaning towards landscapes, it can be the ones we identify the most like the Mediterranean Sea and with the word peace translated into some of the EU languages on the other side of the banknote.
I know my proposals are not creative, but damn… there are options definitely.
Oh, I am also learning a difficult language (Polish).
I did find a couple of things that can be useful:
Happy learning 😇