* The observant child noticed the subtle change in her mother's expression. (Emphasizes the child's attentiveness)
* The detective was known for his observant nature, catching details others missed. (Focuses on the detective's skill)
* Despite being surrounded by chaos, she remained observant, noting every movement and sound. (Highlights observation amidst distraction)
* An observant eye can spot the differences between the two paintings. (Implies careful examination)
* The observant shopper noticed a discrepancy in the price tag. (Shows attention to detail in a practical setting)
Remember to adjust the sentence to fit the context and your desired meaning.