MORE ADVICE FROM POLISH GIRLS PLEASE:)
As a polish man, living with a polish girl, dating polish girls all his life i can tell you that anything that'd work on say, Chinese girl will also work on her, there is absolutely no "polish pick up lines".
Lol is that how you polish guys score? No wonder so many polish girls are over here:) I would try your charming customary tradition but:
Here's real advice though, dont ask women on how to pick them up, they'll tell you how they'd love to be picked up by their dream prince on a white horse but you're not one so their way is not the way to go.
Polish girls typically find it cute if a foreigner tries something in Polish to impress them, if you have Polish friends talk with them let them teach you a single cheesy phrase in Polish like "you're absolutely beatifull" or something, that will catch her attention in a much better way than chatting her up in English, then you can switch to English and if you have a chance at all thats your shot right there, sweettalk yourself into a date and you're soon shagging a straight from the shelf Polish girl.