If "fine" is used to describe quality:
* Comparative: finer
* Superlative: finest
If "fine" is used to describe a small amount (e.g., "a fine mist"):
* Comparative: finer
* Superlative: finest
If "fine" is used to describe a payment (e.g., "a fine for speeding"):
* Comparative: larger
* Superlative: largest
Note: The comparative and superlative forms of "fine" are not always used. Sometimes, we use adverbs like "more" and "most" instead:
* More fine
* Most fine
This is particularly common when we want to emphasize the degree of fineness.