描述 is much like the verb"state",to state something or a person,or maybe a situation.It can be used when u try to describe something to its original condition.
形容,well this word is also used when describe something or someone,but it emphasises the deature or the character.
In general both these 2 words can be understood as"describe",but each emphasises different point,better combine with the particular condition for better understanding lol