A man who is very concerned with how he looks can be called a dandy. The term is rather old-fashioned — it was commonly used to refer to such men in the 1800s, like the famous dandy Beau Brummell.
As an adjective, dandy means excellent. If you think your new car is dandy, you're excited to own such a great car. In modern use, dandy is often used sarcastically, with just a small change in wording or emphasis: "My new car is just dandy. It's broken down twice today already!" The word dandy is also frequently used in the phrase "fine and dandy".