The phrase "a new prowess" is correct and usable in written English.
It can be used to describe a newly acquired skill or ability, often in a context where someone has developed or improved their talents.
Example: "After months of practice, she demonstrated a new prowess in playing the violin that impressed everyone at the concert."
Alternatives: "a newfound skill" or "an enhanced ability".
Over the next month, he demonstrated his sales prowess, drew a new process and national accounts strategy up, and demanded the CRM be implemented -- or else.
And she's flaunting her new prowess in two films in which she plays almost maddeningly take-charge women.
It went from concept car to showroom model in only 18 months, demonstrating General Motors' new prowess in product development.
He stands on his head, and he admires his new prowess at urination — "When I peed, the stream was full, clear, and what I must describe as 'decisive.' " (Contrariwise, poor Max Tivoli, on his backward way to pre-puberty, laments his boyish penis, "a sleek little snail... forever soft, rubbery, good only for peeing long distances on the side of the road").
For all the propaganda of Russia's new prowess, hardly any petrodollars have been invested in basic infrastructure.
The night's headliners -- Rick Ross, 2 Chainz, J. Cole, Kendrick Lamar -- also appeared at last year's show, but most of the acts who took the stage at Anaheim's Honda Center came armed with a new-found prowess.
Resuming his normal life, Marvin discovers he possesses a wonderful new physical prowess that he credits to his ingestion of a loathsome nutritional substance called Badger Milk (which resembles congealed milk of magnesia) that he sees advertised on an infomercial.
Mubarak, Musharraf, Malaysia's Mahathir and a host of other second-world leaders have set a new standard for manipulative prowess: all tell the U.S. they are its friend while busily courting all sides.
Winning a classical music competition is not just down to the performer's musical prowess, a new study suggests.
New York even built a new arena to showcase Ruth's prowess, and when Yankee Stadium opened on April 18 , 1923— against the sorry Red Sox, of all teams — he christened it with a rocket shot over the right-field bleachers, prompting yet another nickname, the House That Ruth Built, which has stuck to this day.
