"Which" is used when choosing from a known or limited set (like specific paintings).
The sentence is asking to identify one from several, so "Which" fits correctly.
Use 'Much' with uncountable nouns. We use much with singular nouns. Question: "How much petrol is in the car?" ...
Use 'Many' with countable nouns. We use many with plural nouns. Question: "How many people were at the meeting?" ...
Use a 'A lot of' and 'Lots of' with both. Both mean a large amount.
"What" is an interrogative pronoun used to ask a question.
It replaces the unknown information (in this case, the name).
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