The phrase "look on" has several synonyms that can be used interchangeably depending on the context. One of the most common synonyms is observe, which implies a more intentional and deliberate act of watching. Another synonym is contemplate, which suggests a deeper level of reflection or thoughtfulness. Alternatively, you might use the verb regard if you wish to convey a sense of admiration or esteem for the object of your attention. Finally, consider the word scrutinize when you need to convey a sense of careful examination or analysis. By using these synonyms, you can add variety and nuance to your vocabulary while still conveying the same basic meaning.