Couldn't add a man to photo generated

That sounds like a sweet image! This is the result  I got with Firefly Image 2 using the prompt you shared "a romantic silhouette of couple at sunset in Santorini"

Are you using Firefly Image 2 or Firefly Image 1?

If you're still getting off results, could you also share your thoughts in the app? Just click the thumbs-up or down icon on the image you're giving feedback on.