Descriptive adjectives are used to help add detail to nouns or a noun phrase. It can be a single adjective which does not require a comma:
Or you can use a series of adjectives. In a series of adjectives, there should be a comma between every adjective except the last one in the series.
If you can naturally (meaning, without it sounding weird) put an "and,” “or,” or "but" between the adjectives, a comma will probably belong there.
The big thing is to figure out if the adjectives are describing or modifying a noun or a noun phrase and be sure to omit the comma before the noun or noun phrase, and be sure that the commas you use “could” be replaced with a connecting word: and, but, or.
There you have it: all I know about commas and descriptive adjectives.