1. Which artist do you like most of the three?

2. Whom do you like most of the three painters?

3. Who do you like best among the three painters?

- I like Renoir most. Though he was in pain, he liked to express happiness and hope.
-------------------------------------
Are the questions and answer grammatical? Which question is commonly used? Do you have some more common questions which have the same meaning?

"Whom" is the objective case, but, in common usage, we would use #3. The uses of "who" and "whom" seem to be blurred now, and may be changing as the language evolves. According to traditional rules, #3 would be incorrect, but probably would be used. Otherwise, all are fine.

1. The question "Which artist do you like most of the three?" is grammatically correct. It is commonly used to ask someone to choose their favorite artist from a given selection.

2. The question "Whom do you like most of the three painters?" is also grammatically correct. However, the use of "whom" in this context is typically seen as more formal or old-fashioned. In modern conversation, it is more common to use "who" instead of "whom." So you could ask, "Who do you like most of the three painters?"

3. The question "Who do you like best among the three painters?" is grammatically correct as well. This is another way to ask someone to express their preference for a painter among the given options.

These three questions have similar meanings and are often used interchangeably. However, the second and third questions may sound a bit more formal or literary compared to the first question.

Here are a few more common questions with similar meanings:
- Out of the three artists, who is your favorite?
- Among these painters, who do you prefer the most?
- If you had to choose one, which artist would you say is the best?