Yes, "Alex Eala shares skincare secrets, diet habits" is grammatically correct and works well as a headline. For a slightly more natural flow, you could also use: Alex Eala shares skincare routine, diet habits

HONG KONG -- While Filipino tennis star Alexandra Eala continues to impress on the court, eagle-eyed netizens have also taken notice of her striking looks and graceful demeanor, which they say could rival those of a…