Online Dating: Should I send a 2nd message if he didn't respond to the 1st?

Anonymous
It's my first time trying online dating. I saw a guy I liked, and I messaged him...Hello, nice picture taken at _____. How was the trip like?

He checked my message, but never responded.

Should I message him back? If so, how long should I wait? And, what should I say?

It's my first time, so I'm so clueless as to what to do and not do.
Online Dating: Should I send a 2nd message if he didn't respond to the 1st?
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