How do you say what a terrific picture in French?

There are a few ways to say "what a terrific picture" in French, depending on the context and the level of formality:

Formal:

* Quelle magnifique photo! (This is a very formal way to say it.)

* C'est une photo formidable. (This is a more neutral, formal way to say it.)

Informal:

* Quelle belle photo! (This is a more informal way to say it.)

* C'est une super photo! (This is a very informal way to say it.)

* La photo est géniale! (This is a very informal way to say it.)

You could also add a compliment about the specific aspects of the picture:

* J'adore les couleurs! (I love the colors!)

* Le cadrage est parfait. (The framing is perfect.)

* C'est tellement réaliste. (It's so realistic.)

The best way to choose the right phrase is to consider your relationship with the person you are speaking to and the situation.