Welcome to Using English.
Please note a few simple rules that will help you get responses faster.
Use proper capitalization.
Ask your question properly.
"Could you please tell me any idioms that mean the opposite of 'you look like a drowned rat'?"
Do you simply mean the person looks good? Looks great? Is in a normal state of not being wet?
EDIT: I have merged your duplicate threads. Please don't post the same question multiple times.