Your picture looks like it should only use about 10 or 12 colours altogether, but closer inspection says that the palette contains 66 colours. Your file's colour count seems to be artificially inflated - this might be an issue from the document you made the file in (if you used a brush or eraser with anti-aliasing, for example), or an issue from saving the file if it had an excessive colour count that your software tried to compress to a lower number. Either way it would be better if you edited this piece further so there weren't as many incidental/accidental excess colours.
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Your picture looks like it should only use about 10 or 12 colours altogether, but closer inspection says that the palette contains 66 colours. Your file's colour count seems to be artificially inflated - this might be an issue from the document you made the file in (if you used a brush or eraser with anti-aliasing, for example), or an issue from saving the file if it had an excessive colour count that your software tried to compress to a lower number. Either way it would be better if you edited this piece further so there weren't as many incidental/accidental excess colours.