This is the 7332nd most frequent Polish word.
karol
"Karol" is a Polish given name equivalent to "Charles" in English.
In this sentence, 'Karola' means 'Karol's' when it comes to possession, showing that the painting belongs to Karol.
Podszedłem do obrazu Karola.
I approached Karol's painting.
Here, 'Karol' is used as a proper noun, referring to the name of a male person.
Karol jest moim przyjacielem.
Karol is my friend.
In this case, 'Karol' is part of a proper name of a location, used in the genitive case to indicate possession or association in Polish grammar.