My professor, who I had work with him before, put a photo with beautiful smile on Whats-App status, I want to say to him that always be happy and I wish that you always be glad and smiley or something like that. Be happy and smiley is correct?
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1In personal messages I wouldn't worry too much about "perfect" English. Sometimes expressing how you really feel, even with grammatical mistakes, is more authentic and pleasant. – Andrew Sep 2 '18 at 19:05
You can say Be happy and smiley in everyday English, but it is a tiny bit awkward because it seems almost like a command that your friend should follow immediately. It's also a little humorous because of that famous Bobby McFerrin song, "Don't Worry, Be Happy."
It might sound better if you said, May you always be happy and smiley. Or: I hope you're always this happy and smiley. That way, it is clear that this is a wish that you have for your friend.
The phrase:
Be happy
is not ungrammatical, but it's not usually the way a native speaker would express a wish for ongoing happiness. Instead, we'd likely switch the verb to something more enduring.
If I wanted to say what it sounds like you're trying to say, I'd probably word it something like this:
Stay happy and keep smiling.
